Added option to arpeggiator to manually disable the running arpeggio

* this simply sets the running_ variable to true or false, which will stop the arpeggio from playing
* this might not be how we want this to work, I will need to experiment when I have my hands on an actual midipal
* it might end up being better to just use the real stop/start routines
* it might also be a good idea to combine stop with notenuke to reduce the need to do that each time
Sloppily disabling several apps not needed for live shows

* will circle back and do this right later if we actually need to
* need to confirm with johnny that these are the apps he wants disable for live use