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