Bind column_titles_visible as property

(cherry picked from commit 7f6ab0006d43866f365287365b25dbcf9e92bebd)

doc/classes/Tree.xml

@@ -21,12 +21,6 @@
 	<tutorials>
 	</tutorials>
 	<methods>
-		<method name="are_column_titles_visible" qualifiers="const">
-			<return type="bool" />
-			<description>
-				Returns [code]true[/code] if the column titles are being shown.
-			</description>
-		</method>
 		<method name="clear">
 			<return type="void" />
 			<description>
@@ -200,13 +194,6 @@
 				Sets the title of a column.
 			</description>
 		</method>
-		<method name="set_column_titles_visible">
-			<return type="void" />
-			<argument index="0" name="visible" type="bool" />
-			<description>
-				If [code]true[/code], column titles are visible.
-			</description>
-		</method>
 	</methods>
 	<members>
 		<member name="allow_reselect" type="bool" setter="set_allow_reselect" getter="get_allow_reselect" default="false">
@@ -215,6 +202,9 @@
 		<member name="allow_rmb_select" type="bool" setter="set_allow_rmb_select" getter="get_allow_rmb_select" default="false">
 			If [code]true[/code], a right mouse button click can select items.
 		</member>
+		<member name="column_titles_visible" type="bool" setter="set_column_titles_visible" getter="are_column_titles_visible" default="false">
+			If [code]true[/code], column titles are visible.
+		</member>
 		<member name="columns" type="int" setter="set_columns" getter="get_columns" default="1">
 			The number of columns.
 		</member>

scene/gui/tree.cpp

@@ -3866,6 +3866,7 @@ void Tree::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_allow_reselect"), &Tree::get_allow_reselect);
 
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "columns"), "set_columns", "get_columns");
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "column_titles_visible"), "set_column_titles_visible", "are_column_titles_visible");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "allow_reselect"), "set_allow_reselect", "get_allow_reselect");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "allow_rmb_select"), "set_allow_rmb_select", "get_allow_rmb_select");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "hide_folding"), "set_hide_folding", "is_folding_hidden");