WIP: FFMPEG_motvec

Consists of several parts: Addition of FFMPEG to core build libraries, gitlab CI KVIDEO object kvideo_fops avi fops module kvideo_dump_frame example, which uses the kvideo api to dump an I-frame and display info, showing off all the useful api calls and how to use them. ffmpeg_motvec (Which doesn't use the kvideo API, but I kept it as useful, working code for comparison -> perhaps delete?)