Added support for 2D shadow casters.
*DANGER* Shaders in CanvasItem CHANGED, if you are using shader in a
CanvasItem and pull this, you will lose them. Shaders now work through a
2D material system similar to 3D. If you don't want to lose the 2D
shader code, save the shader as a .shd, then create a material in
CanvasItem and re-assign the shader.
-=-=-=-=-=-=-=-=-=-
-Moved drawing code to a single function that takes linked list (should make it easier to optimize in the future).
-Implemented Z ordering of 2D nodes. Node2D and those that inherit have a visibility/Z property that affects drawing order (besides the tree order)
-Removed OpenGL ES 1.x support. Good riddance!
-Working area is bigger now, solves #1148
-Using Position now works, fixes#1141
-RGB ops now work, fixes#1139
-Missing bindings to GraphEdit and GraphNode added
-Shader Graph Editor Shows errors on cyclic links and missing connections
-work in progress new graph system (will replace current one)
-crash fix in s3m loader (out of bounds acess)
-fixed vbox overriding of separation (fixes empty line between section tabs)
-=-=-=-=-
Curse the day I decided to port UDP code, as it ended up
being two nights of work. At least It's done now (I hope).
-Fixed UDP Support, API seems stable
-Added UDP Chat demo (chat that can lose your packets, heh)
-Added helpers to areas and bodies to get list of collided bodies and contained bodies.
-Sped up screen/viewport capture code.
-Added code to save an image as PNG
-Small fix so scripts register their singletons after modules did.
-=-=-=-=-
-Fixed problem with scaling shapes (#827), related to not taking scale in consideration for calculating the moment of inertia
-Added support for multiline strings (or comments) using """
-Save subscene bug, properties not being saved in root node (#806)
-Fix Crash in CollisionPolygon2DEditor (#814)
-Restored Ability to compile without 3D (#795)
-Fix InterpolatedCamera (#803)
-Fix UV Import for OBJ Meshes (#771)
-Fixed issue with modifier gizmos (#794)
-Fixed CapsuleShape gizmo handle (#50)
-Fixed Import Button (not properly working in 3D) (#733)
-Many misc fixes (though no new features)
-Fixed many bugs in stretch mode
-Fixes to camera project and unproject as consequence of the above
-added setget to script (documented in script doc)
-more fixes to collada exporter for blender
-=-=-
-Fixed normalmap depth parameter
-Fixes to DirAccess on Windows
-Double click on resource dock will open them
-Fixes to doc generator (should make github wiki on class list more up to date)
-=-=-=-
-Fixed some DAE import & export bugs
-Changed Collada exporter to use the mesh loops API
-Added tangent export to Collada exporter
-Added triangulation option to Collada exporter
-Changed a little how normalmaps are handled in shader. Not sure if it's working properly, be careful.
-Fixed some strange bug with kinematic bodies #776
-Fix release compilaiton issues #782
