assrender v0.31

Change log

0.31 (20210218 - pinterf)

• Fix colors for planar RGB
• code: hidden ifdef FOR_AVISYNTH_26_ONLY for Avisynth 2.6-only build

0.30 (20210217 - pinterf)

• From now assrender does not works with classic Aviysnth: high-bitdepth helper function calls
• 10-16 bit support (including RGB48 and RGB64)
• YV411, Planar RGB support

0.29 (20210216 - pinterf)

• project moved to https://github.com/pinterf/assrender from https://github.com/vadosnaprimer/assrender
• Move to Visual Studio 2019 - v142 platform toolset
• Add .def module definition file for Avisynth 2.6 std compatibility (function name mangling)
• Update Avisynth C headers
• Check Linux and gcc-MinGW CMake build
• Add build instructions and change log to README