Adds new plugin automation buttons: Manual All, Write All, Play All, Touch All

This is 4 new buttons for the generic plugin UI. 
Write All is easier way to say "I'd like to automate everything possible in this plugin".
Play All is "I'd like to play back all automation possible in this plugin".
It iterates over all plugin controls and sets their automation setting, so now if you'd like to 
change all controls' automation settings at once, there are dedicated buttons at the top of the 
generic edit plugin window.