Some Blu-ray discs contain scenes that can be viewed from multiple angles. This option tells mpv which angle to use (default: 1): `--bluray-angle=<ID>` mpv used to support this feature, but it was accidentally dropped when removing dvd/bluray menu support in 2 commits: https://github.com/mpv-player/mpv/commit/c844d57489fa83c0db66f84285ca1c07f6c71c6b and https://github.com/mpv-player/mpv/commit/35e8b6c1e68ae936ca0aeee4f30732cd13ef9932.
