Mark navigation classes and nodes as experimental

The navigation team has some large changes planned for navigation in the 4.x timeframe, so marking these nodes as experimental to give users a heads up that the API may change in breaking ways.

doc/classes/NavigationAgent2D.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="NavigationAgent2D" inherits="Node" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="NavigationAgent2D" inherits="Node" is_experimental="true" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		2D Agent used in navigation for collision avoidance.
 	</brief_description>

doc/classes/NavigationAgent3D.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="NavigationAgent3D" inherits="Node" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="NavigationAgent3D" inherits="Node" is_experimental="true" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		3D Agent used in navigation for collision avoidance.
 	</brief_description>

doc/classes/NavigationLink2D.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="NavigationLink2D" inherits="Node2D" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="NavigationLink2D" inherits="Node2D" is_experimental="true" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		Creates a link between two locations that [NavigationServer2D] can route agents through.
 	</brief_description>

doc/classes/NavigationLink3D.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="NavigationLink3D" inherits="Node3D" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="NavigationLink3D" inherits="Node3D" is_experimental="true" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		Creates a link between two locations that [NavigationServer3D] can route agents through.
 	</brief_description>

doc/classes/NavigationMesh.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="NavigationMesh" inherits="Resource" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="NavigationMesh" inherits="Resource" is_experimental="true" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		A mesh to approximate the walkable areas and obstacles.
 	</brief_description>

doc/classes/NavigationMeshGenerator.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="NavigationMeshGenerator" inherits="Object" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="NavigationMeshGenerator" inherits="Object" is_experimental="true" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		Helper class for creating and clearing navigation meshes.
 	</brief_description>

doc/classes/NavigationObstacle2D.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="NavigationObstacle2D" inherits="Node" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="NavigationObstacle2D" inherits="Node" is_experimental="true" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		2D Obstacle used in navigation for collision avoidance.
 	</brief_description>

doc/classes/NavigationObstacle3D.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="NavigationObstacle3D" inherits="Node" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="NavigationObstacle3D" inherits="Node" is_experimental="true" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		3D Obstacle used in navigation for collision avoidance.
 	</brief_description>

doc/classes/NavigationPathQueryParameters2D.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="NavigationPathQueryParameters2D" inherits="RefCounted" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="NavigationPathQueryParameters2D" inherits="RefCounted" is_experimental="true" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		Parameters to be sent to a 2D navigation path query.
 	</brief_description>

doc/classes/NavigationPathQueryParameters3D.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="NavigationPathQueryParameters3D" inherits="RefCounted" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="NavigationPathQueryParameters3D" inherits="RefCounted" is_experimental="true" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		Parameters to be sent to a 3D navigation path query.
 	</brief_description>

doc/classes/NavigationPathQueryResult2D.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="NavigationPathQueryResult2D" inherits="RefCounted" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="NavigationPathQueryResult2D" inherits="RefCounted" is_experimental="true" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		Result from a [NavigationPathQueryParameters2D] navigation path query.
 	</brief_description>

doc/classes/NavigationPathQueryResult3D.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="NavigationPathQueryResult3D" inherits="RefCounted" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="NavigationPathQueryResult3D" inherits="RefCounted" is_experimental="true" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		Result from a [NavigationPathQueryParameters3D] navigation path query.
 	</brief_description>

doc/classes/NavigationPolygon.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="NavigationPolygon" inherits="Resource" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="NavigationPolygon" inherits="Resource" is_experimental="true" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		A node that has methods to draw outlines or use indices of vertices to create navigation polygons.
 	</brief_description>

doc/classes/NavigationRegion2D.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="NavigationRegion2D" inherits="Node2D" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="NavigationRegion2D" inherits="Node2D" is_experimental="true" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		A region of the 2D navigation map.
 	</brief_description>

doc/classes/NavigationRegion3D.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="NavigationRegion3D" inherits="Node3D" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="NavigationRegion3D" inherits="Node3D" is_experimental="true" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		A region of the navigation map.
 	</brief_description>

doc/classes/NavigationServer2D.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="NavigationServer2D" inherits="Object" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="NavigationServer2D" inherits="Object" is_experimental="true" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		Server interface for low-level 2D navigation access
 	</brief_description>

doc/classes/NavigationServer3D.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="NavigationServer3D" inherits="Object" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="NavigationServer3D" inherits="Object" is_experimental="true" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		Server interface for low-level 3D navigation access
 	</brief_description>