v0.5: Sound Effects

Here comes a small but key update for Harmonies Garden. It mostly add one feature: SFX! Subtle noises giving some kind of feedback for every actions, as well as creating emergent percussions.

I also implemented a subtle compressor. Its effect is very small, otherwise it would break the balance on which I've already worked. Maybe it will help reduce the loudness of future tiles? We'll see if it's useful.