vd_lavc: add ProRes RAW to the list of enabled by default hwdecs

[cyanreg]

Unlike all other codecs, ProRes RAW is pretty much guaranteed to be slow as hell on the CPU, always having thousands of tiles. And even on a very slow GPU, a CPU decode won't be anywhere near to usable to make a difference.

[atrxia1]

Docs for the --hwdec-codecs option needs to be updated as well to include prores_raw

[cyanreg]

Docs for the --hwdec-codecs option needs to be updated as well to include prores_raw

No, all codec names are accepted, even for codecs with no hwaccel hooks in lavc.

[guidocella]

The docs can be changed to say to use --help=hwdec-codecs to see the default codecs, like is already done for other options to avoid updating the docs everytime.

[cyanreg]

@guidocella done