GL: Fixed ETC1 format override logic.
Fixed bad offset for ETC2 planar mode decoding.
Fixed ETC1 mod table.
Replaced custom allocator handling.
Removed context static inialization.
Fixed GL memory leaks.
Cleanup.
Updated README.
GL: Unbind VAO before using clear quad.
Added 13-stencil example.
Indent fix only.
Fixed implicit casting.
RenderStates refactored in global scope.
Fixed 13-stencil shaders to be DX friendly + added gles compiled shaders.
Tweaked lightning attenuation in shaders.
Garbage cleanup.
fixed setTexture bug
Added imgui options for light/scene update