Engine: fixed channels forced to HTP/LTP multiple times

Updated changelog
New fixture: Eurolite LED CBB-3 COB RBG 3x15W Bar (thanks to Thomas Demmel)
New fixture: Pulse SlimLite 56 (thanks to Jimmy Traylor)
New fixture: lightmaXX Platinum Line Mini PAR QUAD 7x8W (thanks to Thomas Demmel)
New fixtures: DNA Pro Slim 18 RGBW, Martin MAC600 NT, Starway ServoColor 600, Starway ServoColor 800 (thanks to Thierry Rodolfo)

New fixture: Eurolite LED PMB-4 COB RGB 30W Bar (thanks to Thomas Demmel)
New fixtures: Vari-Lite VL2500 Wash, Martin JEM K1 Hazer, Generic Smoke (thanks to Thierry Rodolfo)
Updated translations (UI)