* initial impl of ansible -> TXo leader OK

* leader mode with programmable addrs etc, works w/ TXo

* leader mode octave + track select

* fix some issues with leader track selection

* fix leader mode cfg not working on all grid apps

* fix i2c follower octave calculation + flash saving

* use TO.TR instead of TO.TR.P for er301 triggers

* split follower controls out to separate functions

* mode selection for different followers works

* fix velocity scaling, some parameter UI

* leader mode rework ok

* fix some issues with cv/gate mode and octave offsets

* release polyphonically allocated notes

* fix preset key, JF.MODE, and voice alloc bugs

* reorder JF.MODE 0 and JF.TR 0 for maybe fewer pops?

* send TXo trigger messages in lower byte

* also use 4-byte message for TO.ENV

* restore / change all TXo settings when switching state

* don't retune values sent to followers

* silence followers when resuming apps

* add doc defs for leader mode settings