Disabling all apps except monitor and arpeggiator, at johnny's request

* this has been done via commenting it out, I should probably do this as a makefile directive
* will circle back on that later
Lowering encoder knob hold time for app selector

* app selector is now 7.5 seconds
* cancel hold is still at 2.5 seconds
Removing arp stop/start option, fixing notenuke option

* the app start/stop option was messing with sync, so we can't use it
* fixing notenuke to only nuke notes on the currently selected channel, since doing that across all 16 channels was taking too long
* doing it for only one channel seems to get the job done in between ticks
Removing arpeggio restart on preset change
Putting knob hold time back to 15 seconds
Adding new arpeggiator presets

* replaced existing presets with more up and down variety
* added notes to each preset so we can remember which is which
* current patterns are:
  * up, 1 octave, normal time
  * up, 2 octaves, normal time
  * up, 1 octave, half time
  * down, 2 octaves, half time
  * up+down, 2 octaves, normal time
  * up+down, 1 octaves, normal time