* Get rid of the non-functional GT2 loader
* Add the UMX loader
* Add HQ mixer routines (and make it configurable)
* Allow samplerate to be configured at run/playtime
* Support >64KHz mixing/playback
* Correctly restore non-boost status
(The diff to upstream is much smaller now too!)
Change-Id: Iaa4ac901ba9cd4123bb225656976e78271353a72
