add version_info and icon sections in "export to windows platform".
add version_info and icon to godot exe file (editor & template exe).
fix an problem in image class.
change all default icons to android export icon (a little more rounded).
create an python script for convert file to cpp byte array for use in
'splash.h'.
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-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!