gui: improved keyboard control and value display
gui: refactored - moved update()
gui: much improved modulator definition
gui: added reset()
gui / voxelspace: modulation settings can now be defined in each voxelspace's settings.json
gui: refactored, modularized Domulatrix()
gui: added flash_leds()
gui: added prev_voxelspace() and next_voxelspace()
voxelspace: raise JsonError if settings can't be loaded
gui: multiple load_voxelspace()'s work
gui: remove TitlePad()
tmp! added test_watchdog.py and test_scanfolders.py
gui: added find_available_voxelspaces()
data: removed stale voxelspaces
voxelspace: supports multiple settings_*.json per voxelspace
gui: pass settings file (not folder) as argument
gui: cycling trough available voxelspaces works!
data: added voxelspace "painted"
gui: [escape] to stop gui
gui: self.stop()
gui: at startup - indicate wether fast or slow voxelspace is used