larger API, include loop points and event callback

• fixed tests a717612
• larger API (loop points, note events callback) b2c0fc9
• new wrapper providing registration of JS callback 64e0d5a
• removed VoiceStealing strategy related stuff 4c6b7dc
• update lib submodule commit 947f36a
• adapted to feat/iterable-chronology branch b5cf39b
• adapt to new Renderer constructor 1907f95
• todo : compile static lib and include in wasm ? ddf6719
• adapt to new lib folder hierarchy + minor updates 8961594

v0.2.0...v0.3.0