Dolby Vision support

[ark-1]

Currently, if you open a Dolby Vision file, it is opened with wrong colors. mpv already has some support for Dolby Vision (https://github.com/mpv-player/mpv/issues/7326) with --vo=gpu-next flag. Upstream issue: https://github.com/iina/iina/issues/3313.

If it is indeed as simple as providing an option to mpv, can you please support it 🥺? Thanks!