When the backend is dropped or changed, on engine-restart
the connection_handler() re-establishes already connected ports.
There's no disconnect when the backend dies or is hard-stopped.
* include Mixbus PRE plugin on Mixbusses
* Mixbus master-assign on right-most "S" button
* fix parameter-banking and assignment
* fix typo in 029e963fb (fader range constaint)
In case of VCA masters or otherwise the value can exceed the max
+6dB and internal_to_interface() returns a value > 1.0 which cannot
be represented on the physical fader (MIDI &0x7f wraps)
* make shift buttons equivalent
* 2 x stop: move to session-start
* RTZ: return to zero (not session-start)
* in Pan mode: encoder controls pan-width (w/o shift)
