Added basic Pico MIDI setup
Added MIDI only setup for Alpha, fixed MIDI only setup for Pico
Added Tau MIDI only experimental setup.
Fixes to Alpha and Pico MIDI only setups.
Fixes to some ports that should be connected always explicitly, notably
those for Talker actions, but also other ports that have hidden
connections.
Merge branch '2.0' into 2.0-leopard