NEW: It is now possible to control RGB Matrices intensity

Fixed crash with RGB matrix editor open (again)
Added 2 new RGB scripts: fill columns and fill rows
Fixed "RGB Matrixes" to "RGB Matrices"
Added fixture: Robe_ColorMix_240_AT (thanks to Lorenzo Andreani)
Merge branch 'master' of git://github.com/mcallegari/qlcplus