Negative indices index from the end of the array.
Indices are range checked before attempting and return appropriate error when out of range.
Binding for RawArray in gdscript to access DVector.subarray() provided.
Documentation of RawArray.subarray() in classes.xml provided.
This effectively allows invert() to be used on the following types:
ByteArray, IntArray, RealArray, StringArray, Vector2Array, Vector3Array, ColorArray
-Added Navigation & NavigationPolygon nodes
-Added corresponding visual editor
-New pathfinding algorithm is modern and fast!
-Similar API to 3D Pathfinding (more coherent)
