Add "Notes" function to parked channels

How many times have you sat down at your desk after someone else has been covering you or has touched your board for one reason or another and thought "Huh, I wonder why this channel is parked?"

The thought crossed my mind while mousing over a note on a cue "wouldn't it be nice to mouse over the little 'P' in the channel tombstone and read a little bit about why that channel is parked?" I could honestly use a note function for just about anything (palettes, presets) to give a little more detail about why we made something the way it is now. "Park" however is the one thing where I find myself wondering "does this still need to be parked or is it load bearing?" and "where's that post-it that said why these channels are parked?"