arc abstraction update

unified multiple arc knob abstractions under a singla abstraction:
bp.arc.knob. Updated granular and phase vocoder to use unified
abstraction
morphing fix

removed dict for thread safe operation
further morphing refinements
graphic update

updated backgrounds and LEDs of all envelopes
removed dict from spectra
keyboard update

gate was outputting crazy values. Major overhaul related to
simplification using touchscreen mode.