Draft: vlc_es: remove RGB masks from video_format_t

Draft on top of !4269 (closed), !4119 (closed), !4255 (closed), !4225 (closed), !4201 (closed), !4183 (closed)

The RV32, RV24, RV16, RV15 fourcc's are mapped to the new "fixed memory order" chroma based on the default mask they used to match.

There will be follow up patches to remove some dead code here and there.