Music: enable MIDI

[ForNeVeR]

TODO

• [x] Find a good sound font and embed it (download in compile-time since we can do that)
• [x] Use the same volume for sound and music
• [x] Figure out if we really need NAudio
  • [x] First of all, try migrating to this sample suggested by @sinshu
  • [x] Try finding a lighter library for .wav file writing
  • [x] Maybe see this thread
  • [x] Migrate to Raylib .wav playback facility
• [x] If we still use NAudio, use only those sub-libraries that we need, and not the whole library suite
• [x] Get rid of files and read data directly
• [x] See what about streaming, 50 MiB .wav file is kinda scary
• [x] Wire the music playback/stop commands with the common sound core
• [x] Better asynchrony
• [x] Test on Mac
  • No need, we know Raylib works

After review

• [x] TODO sweep

After merge

• [x] Create an issue on sound settings (either a UI, a settings file parameter, or better both, maybe separate volume settings)

[sinshu]

If you are using Raylib_CsLo and MeltySynth, you can stream MIDI files using Raylib_CsLo's AudioStream.

Here is a link to a code example (in C#): https://github.com/sinshu/meltysynth/tree/main/Examples/Raylib_CsLo

By using this method, you won't need NAudio, and there is no need to place large sound data in memory.

[ForNeVeR]

@sinshu, thanks a lot for your advice — and for MeltySynth as well. It's great!

[ForNeVeR]

https://github.com/sinshu/meltysynth/tree/main/Examples/Raylib_CsLo works flawlessly.