Add support for ogg vorbis / ogg opus

[pseiler]

As I encode most of my Music as ogg vorbis, please add support for it. Ogg Opus is also used often in podcasts etc and is a future-proof codec.

I already opened a issue on the codecs github project (https://github.com/mackron/dr_libs/issues/139), but this seems not a solution for the near future. But I found this (for vorbis support): https://nothings.org/stb_vorbis/