Environment SFX manager

[avaer]

We already have a set of long-short env sfx per biome. The environmental sfx will need to be triggered by the procedural generation engine.

This can be a simple API, like:

import metaversefile from 'metaversefile';
const {environmentSfxManager} = metaversefile;
environmentSfxManager.setSfxEnvironment('lava'); // enable
environmentSfxManager.setSfxEnvironment(null); // disable

Internally the system should loop the long/short sounds randomly.