Add ability to set emitter data for additive color mixing system whenever a aingle additive color is used#70

Add ability to be able to set emitter data for the case of not having “RGB” as a base and we need to check the implications this could have, as I believe some code in the color mixing algorithms actually relies on having at least Red, Green and Blue - we will investigate further and update you; however please note that if we address this it will most likely be at the end of the development cycle or in a later maintenance update.