Bugfix release: * [OpenGL] Add support for RG8 textures * [OpenGL] Support nonperspective interpolation on GLES hosts * [OpenGL] Improve support for texture shadow LOD * [Vulkan] enable support for more extensions * [Video] Add support for H264 and H265 video encoding * Enable the use of external objects for AMDGPU based hosts * Fix caching type for llvmpipe based hosts thereby enabling blob resources * Fix a series of errors reported by static analysis and other bugs (see git log)