Uncap the range for gravity and change the slider hints

There's not really a reason to cap the gravity amount, and we can also
give better hints for the range (for 3D, ±32 is much more sensible
than ±1024).

(cherry picked from commit e0facdaf616666debe353a9472568629a484fff4)

doc/classes/Area.xml

@@ -105,7 +105,7 @@
 			The physics layers this area scans to determine collision detection. See [url=https://docs.godotengine.org/en/3.3/tutorials/physics/physics_introduction.html#collision-layers-and-masks]Collision layers and masks[/url] in the documentation for more information.
 		</member>
 		<member name="gravity" type="float" setter="set_gravity" getter="get_gravity" default="9.8">
-			The area's gravity intensity (ranges from -1024 to 1024). This value multiplies the gravity vector. This is useful to alter the force of gravity without altering its direction.
+			The area's gravity intensity (in meters per second squared). This value multiplies the gravity vector. This is useful to alter the force of gravity without altering its direction.
 		</member>
 		<member name="gravity_distance_scale" type="float" setter="set_gravity_distance_scale" getter="get_gravity_distance_scale" default="0.0">
 			The falloff factor for point gravity. The greater the value, the faster gravity decreases with distance.

doc/classes/Area2D.xml

@@ -107,7 +107,7 @@
 			The physics layers this area scans to determine collision detection. See [url=https://docs.godotengine.org/en/3.3/tutorials/physics/physics_introduction.html#collision-layers-and-masks]Collision layers and masks[/url] in the documentation for more information.
 		</member>
 		<member name="gravity" type="float" setter="set_gravity" getter="get_gravity" default="98.0">
-			The area's gravity intensity (ranges from -1024 to 1024). This value multiplies the gravity vector. This is useful to alter the force of gravity without altering its direction.
+			The area's gravity intensity (in pixels per second squared). This value multiplies the gravity vector. This is useful to alter the force of gravity without altering its direction.
 		</member>
 		<member name="gravity_distance_scale" type="float" setter="set_gravity_distance_scale" getter="get_gravity_distance_scale" default="0.0">
 			The falloff factor for point gravity. The greater the value, the faster gravity decreases with distance.

doc/classes/ProjectSettings.xml

@@ -946,7 +946,7 @@
 			[b]Note:[/b] Good values are in the range [code]0[/code] to [code]1[/code]. At value [code]0[/code] objects will keep moving with the same velocity. Values greater than [code]1[/code] will aim to reduce the velocity to [code]0[/code] in less than a second e.g. a value of [code]2[/code] will aim to reduce the velocity to [code]0[/code] in half a second. A value equal to or greater than the physics frame rate ([member ProjectSettings.physics/common/physics_fps], [code]60[/code] by default) will bring the object to a stop in one iteration.
 		</member>
 		<member name="physics/2d/default_gravity" type="int" setter="" getter="" default="98">
-			The default gravity strength in 2D.
+			The default gravity strength in 2D (in pixels per second squared).
 			[b]Note:[/b] This property is only read when the project starts. To change the default gravity at runtime, use the following code sample:
 			[codeblock]
 			# Set the default gravity strength to 98.
@@ -993,7 +993,7 @@
 			[b]Note:[/b] Good values are in the range [code]0[/code] to [code]1[/code]. At value [code]0[/code] objects will keep moving with the same velocity. Values greater than [code]1[/code] will aim to reduce the velocity to [code]0[/code] in less than a second e.g. a value of [code]2[/code] will aim to reduce the velocity to [code]0[/code] in half a second. A value equal to or greater than the physics frame rate ([member ProjectSettings.physics/common/physics_fps], [code]60[/code] by default) will bring the object to a stop in one iteration.
 		</member>
 		<member name="physics/3d/default_gravity" type="float" setter="" getter="" default="9.8">
-			The default gravity strength in 3D.
+			The default gravity strength in 3D (in meters per second squared).
 			[b]Note:[/b] This property is only read when the project starts. To change the default gravity at runtime, use the following code sample:
 			[codeblock]
 			# Set the default gravity strength to 9.8.

scene/2d/area_2d.cpp

@@ -650,7 +650,7 @@ void Area2D::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "gravity_point"), "set_gravity_is_point", "is_gravity_a_point");
 	ADD_PROPERTY(PropertyInfo(Variant::REAL, "gravity_distance_scale", PROPERTY_HINT_EXP_RANGE, "0,1024,0.001,or_greater"), "set_gravity_distance_scale", "get_gravity_distance_scale");
 	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "gravity_vec"), "set_gravity_vector", "get_gravity_vector");
-	ADD_PROPERTY(PropertyInfo(Variant::REAL, "gravity", PROPERTY_HINT_RANGE, "-1024,1024,0.001"), "set_gravity", "get_gravity");
+	ADD_PROPERTY(PropertyInfo(Variant::REAL, "gravity", PROPERTY_HINT_RANGE, "-4096,4096,0.001,or_lesser,or_greater"), "set_gravity", "get_gravity");
 	ADD_PROPERTY(PropertyInfo(Variant::REAL, "linear_damp", PROPERTY_HINT_RANGE, "0,100,0.001,or_greater"), "set_linear_damp", "get_linear_damp");
 	ADD_PROPERTY(PropertyInfo(Variant::REAL, "angular_damp", PROPERTY_HINT_RANGE, "0,100,0.001,or_greater"), "set_angular_damp", "get_angular_damp");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "priority", PROPERTY_HINT_RANGE, "0,128,1"), "set_priority", "get_priority");

scene/3d/area.cpp

@@ -696,7 +696,7 @@ void Area::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "gravity_point"), "set_gravity_is_point", "is_gravity_a_point");
 	ADD_PROPERTY(PropertyInfo(Variant::REAL, "gravity_distance_scale", PROPERTY_HINT_EXP_RANGE, "0,1024,0.001,or_greater"), "set_gravity_distance_scale", "get_gravity_distance_scale");
 	ADD_PROPERTY(PropertyInfo(Variant::VECTOR3, "gravity_vec"), "set_gravity_vector", "get_gravity_vector");
-	ADD_PROPERTY(PropertyInfo(Variant::REAL, "gravity", PROPERTY_HINT_RANGE, "-1024,1024,0.01"), "set_gravity", "get_gravity");
+	ADD_PROPERTY(PropertyInfo(Variant::REAL, "gravity", PROPERTY_HINT_RANGE, "-32,32,0.001,or_lesser,or_greater"), "set_gravity", "get_gravity");
 	ADD_PROPERTY(PropertyInfo(Variant::REAL, "linear_damp", PROPERTY_HINT_RANGE, "0,100,0.001,or_greater"), "set_linear_damp", "get_linear_damp");
 	ADD_PROPERTY(PropertyInfo(Variant::REAL, "angular_damp", PROPERTY_HINT_RANGE, "0,100,0.001,or_greater"), "set_angular_damp", "get_angular_damp");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "priority", PROPERTY_HINT_RANGE, "0,128,1"), "set_priority", "get_priority");