TrColour Class v1.0 soon

Soon, an extension of Colour Class will be released. This extension deals with transparent colours, inheriting most of its functions from Colour Class. It will be capable of performing inteligent colour mixing (based not only on the mixing factor, but also on alpha), or alpha blending (it's a wrong term for the operation, since it "blends" two transparent colours instead of one opaque background colour and other transparent colour). Essentially, it makes Colour Class a little more powerfull.