Vix 564

Fixed Crash caused by an error in the ElementCount calculation vs the actual number of channels in the V2 sequence.
Added the ability to set the RGB color mixing order instead of assuming RGB (vs BGR etc...).
Changed names from RGBpixel to Color mixing to align with the terminology in the patching screens.
Added override of color mixing when the incorrect number of V2 channels are assigned to a V3 element. Reverts to non color mixing mode in this condition instead of ignoring the offending channels.