Deprecated LwjglRenderer and Lwjgl's TextureUtils. URA is used when choosing LWJGL as renderer.
One can now call readFrameBuffer with a specific format, implementation has been done for the GLRenderer only.
For now only placeholders have been done for the renderers that are still not using URA (all except LWJGL).
The skyFactory now supports Equirectangular environment maps, as it's a pretty popular format.
It has been refactored to handle the 3 env map types : CubeMap, SphereMap, EquirectMap
Minor fix in TestRenderToCubeMap
updated gitignore so that it ignores sdk dist files