Resolve "colorpicker doesn't consider border correctly"
Color picker now uses getMousePosOnImage to get the mouse position instead of relying on its own logic. This solves problems with border and distortion.
Also, the RectPlotItem now does not delete the last map, but instead replaces it with a default one (letting everything through), so the indices still work.
Closes #57 (closed)
Edited by d.kilic