Simplify /shape/shape_color_to_mono.py so it correctly handles the new processing...

Simplify /shape/shape_color_to_mono.py so it correctly handles the new processing steps (mono, colour, rounded) but does not handle the old shape_(d)hgr.png anymore, revert shape3.png to the un-enhanced version and add shape4.png as the enhanced version (because enhancing loses the ability to recreate the original source), replace /shape/shape_hgr.png with a new version based on shape1.png for mono (parachute, derrick, part of radar, digits) and shape3.png for colour (others), replace /shape/shape_dhgr.png with a new version based on /shape/shape_hgr.png with the shifted STAR BLAZER text added but losing manually re-coloured shapes