RetroEdit: Editing...

I've almost got editing working, I can click on the bitmap and it draws a pixel into the right place. Theres still loads to do, but it shouldn't take long now. Once I get editing and saving working, i can let Luca lose on it and try it out - it should help him do later level sprites. I'm expecting great things from him once he gets a good editor, as hes already done amazing things with - well, crap editors!