Add Amber color to fixture definitions & click&go

...so the fixtures are created properly; I don't plan any RGBW/RGBA/RGBWA color picker.
CLick&Go: CMY channels start from white
Merge pull request #203 from tornel/master

Some more fixes to the Spanish Translation + small edit in About Box
Merge pull request #201 from janosvitok/master

Added amber color + Click&Go improvements
RGB Matrix: if a head includes a dimmer channel, it will be controlled by a RGB Matrix

UI: Fixed QLC+ website URL click event
Reviewed all the fixtures with heads to include a dimmer channel
Updated docs