[PATCH 2/2] move src/audio to src/modules/audio

[Andrei Kholodnyi]

I'm not sure we need it in this form.

Personally I dislike having source code and a subdir in one place.
Module consists of 3 parts, communication part, synth part and an audio part.
Probably it would be better to have modules/audio, modules/synth, modules/main.
Apart of that there are some utils that could be e.g. separated in a lib.