Parts that contain program change messages should indicate it in Composer view

Right now it's impossible to tell when a part contains a PC. Possible ideas:

Put a [PC] emblem or midi icon on the upper-left corner of the part (would be less helpful on very long parts and/or parts which contain multiple PCs)
Draw a vertical line or exclamation point from top to bottom where the Program Change occurs (would appear with the midi notes preview)
Perhaps both

falkTX / los