Add mobile objects, cribbed from helen04

Resized the views for the smaller resolution
Remove hardcoded OSC input BP name
Fix GUI update bug: Should work even if no TouchOSC client is there
Add a mixer-control mapper. Reuses GC watch mechanism. That's not good.
Fix mixer-control mapping. Now coexists with watched controls.

Also made gcmap more convenient: If you don't give a spec, now it
will use the global-control's spec.