~rabbits/dito

Minor cleanup
Add keys 1-4 to pick up the correspending picker

If you move a picker onto a black area of the image, the picker doesn't
stand out against the background. This makes it easy to lose pickers in
black areas and difficult to pick them up again.

This change adds an alternative method of moving pickers. Even if you
can't find the picker to click on it with the mouse, you can press the
corresponding keyboard key to grab and move it to your mouse cursor.
Added icn export
Pattern takes 0&3 colors
Standardize draw functions
Ignore output files
Fixed black bmp issue
Added indicators
Basic version
Added color pickers