Hotfix 0.01.00.44 - Synth velocity and minor fixes

* Synth supports velocity sensitive hits and is lower latency when triggered to match the drum response
* Optimised avatar recording and playback
* Cleaned up glitch in landscapes in snowy and afghan worlds
* Optimized Avatars and hands
* Loading screen better on moving between worlds when in single player
* Now defaults to fixed velocity off on new installs