Implement OSC interface and redesign request/reply interface
Add API method for querying external audio bus indices
Remove superfluous methods
Bind Methcla API
Throw exception when resource ID is out of range
Remove superfluous include
Update oscpp to upstream HEAD
Add isGroup and isSynth introspection methods
Add check for bus type when mixing or copying
Add methods for number if inputs/outputs (again)

Will be useful for SynthDefs with variable numbers of inputs/outputs.
Add bus mapping API command