Added fixture: Optima Lighting PAR64 LED (thanks to Ryan Kelley)
OSX: This is getting ridiculous...
Function Manager: fixed typo

create-dmg: works with Qt5 too
Contributors fixes
Added fixtures: Cameo CLPFLAT1TRI3W, Stairville maTrixx SC-100, Varytec LED Magic Mushroom (thanks to Jan Nolte)

Added fixture: Stairville LED bar 240/8 RGB (thanks to Mikko Toivonen)
Main: Added the possibility to log to file ($HOME/QLC+.log)