Add rotate_toward and angle_difference to GDScript and C#

doc/classes/@GlobalScope.xml

@@ -85,6 +85,14 @@
 				[/codeblock]
 			</description>
 		</method>
+		<method name="angle_difference">
+			<return type="float" />
+			<param index="0" name="from" type="float" />
+			<param index="1" name="to" type="float" />
+			<description>
+				Returns the difference between the two angles, in the range of [code][-PI, +PI][/code]. When [param from] and [param to] are opposite, returns [code]-PI[/code] if [param from] is smaller than [param to], or [code]PI[/code] otherwise.
+			</description>
+		</method>
 		<method name="asin">
 			<return type="float" />
 			<param index="0" name="x" type="float" />
@@ -1110,6 +1118,17 @@
 				Creates a RID from a [param base]. This is used mainly from native extensions to build servers.
 			</description>
 		</method>
+		<method name="rotate_toward">
+			<return type="float" />
+			<param index="0" name="from" type="float" />
+			<param index="1" name="to" type="float" />
+			<param index="2" name="delta" type="float" />
+			<description>
+				Rotates [param from] toward [param to] by the [param delta] amount. Will not go past [param to].
+				Similar to [method move_toward], but interpolates correctly when the angles wrap around [constant @GDScript.TAU].
+				If [param delta] is negative, this function will rotate away from [param to], toward the opposite angle, and will not go past the opposite angle.
+			</description>
+		</method>
 		<method name="round">
 			<return type="Variant" />
 			<param index="0" name="x" type="Variant" />