Cineform Decoder Improvements

The GoPro Cineform codec is a cross-platform intermediate codec designed for editing high-resolution footage. It was original designed for compressed Digital Intermediate workflows for film or television applications using HD or higher resolution media. FFmpeg reverse engineered Cineform decoder currently supports progressive video files with image formats YUV 4:2:2 10-bit, RGB and RGBA 4:4:4 12-bit. This project aims to support more features present in cineform codec, namely Inverse Temporal Transform for p-frames, deinterlacing support, assembly instructions integration into the ffmpeg version, and making it faster by using threading models present in FFmpeg. The result of this project will be that Cineform decoder can be integrated with many tools that use FFmpeg libav.