* Add iCON Pro Audio P1-NANO device with option of P1-X extenders left or right
* Resolve Metering on P1-M/X and P1-NANO
* Resolve SMPTE/beats display on P1-M/X and P1-NANO
Adds a device profile for iCon Platform M+ controller and new function
that flips between editor and mixer window. This function is mapped to
"mixer" button on controller.