Docker: Add more & update libraries for FFmpeg (#1279)
* Fix error: x265 not found using pkg-config
Need to checkout tag or fetch tags, see https://bitbucket.org/multicoreware/x265_git/issues/572/pc-file-is-not-generated
* Add libs ogg, vorbis, theora, webp, xvid, openjpeg, png to ffmpeg
* ffmpeg x265 uses libnuma (but optional)
ci-common image not updated yet, pkg-config error resolved by checking out a tag. Installing libnuma was a suggested fix here: https://stackoverflow.com/questions/51918409/compiling-ffmpeg-x265-not-found-using-pkg-config
* Add Docker Images readme
Simran
9d029c4ae4