Reorganize symphonia's feature flags

[Keinsleif]

Symphonia's feature flags are separated into format flags and codec flags. Current symphonia flags wrapped in rodio is a mixture of these two types.

This PR reorganize these flags to format-based (extension-based like). The flags are separated by format and each flags are contains possible codec flags in the format.

Detail

• symphonia-aac not changed

• symphonia-flac not changed

• symphonia-isomp4 mpa(mp3+mp2+mp1), aac, alac flags are added.

• symphonia-mp3 not changed

• symphonia-ogg vorbis, flac, pcm flags are added

• symphonia-vorbis deleted vorbis flag is codec name in symphonia Standalone vorbis format is not general as far as I could find.

• symphonia-wav not changed

• symphonia-alac not changed

• symphonia-aiff not changed

• symphonia-caf added Core Audio Format support With pcm, adpcm, mpa(mp3+mp2+mp1), aac, alac flags

• symphonia-mkv added mkv (actually mka) and webm support With aac, mpa, vorbis, pcm, flac, alac flags

Note: Currently, symphonia is not support opus codec. These formats can contain opus format. isomp4, ogg, caf, mkv(webm)

[yara-blue]

First off all thanks for helping out!

D note some of this work is underway in PR731. I do however not think @roderickvd minds you taking this on instead.

Please see the related discussion in: https://github.com/RustAudio/rodio/pull/731

[roderickvd]

With thanks, I think this was covered with #753. Feel free to update and re-open if you have further suggestions.