Clarify the use of dr_libs (dr_wav)

[dvzrv]

When looking into building libossia against system-provided dependencies, I noticed, that dr_libs is pulled in, but from a cursory search in the code-base only dr_wav is used.

This appears important, because the dr_libs repository tracks dr_wav, dr_mp3 and dr_flac with differing tags/released versions.

Is the use beyond dr_wav planned? Is my assumption correct, that only dr_wav is used?

[jcelerier]

Yes, only dr_wav! I didn't even conceive of those as separate libraries though, for me it was dr_libs as a package aha