Frontend controls for filter
Added LFO to filter - no frontend as yet
Fixing compilation error
LFO tweaks, new command line options


Better XRUN handling. Moving memset out of audio callback.
Merge branch 'dev' of github.com:adampointer/piSynth into dev

Conflicts:
	src/main.c
Abandoning io multiplexing in favour of multi-threading
Merge branch 'dev'