Added basic gcode/DXF import, and basic gcode drawing.  Not all working yet, but checking in.
Checkpoint commit before changing “Resha” to “Risha” in all code, since Risha (Ree-sha) matches the sounds of the arabic better.
Resha -> Risha throughout
Changes in DXF => Gcode boilerplate to suit the M300 laser power command.
Basic DXF / Gcode drawing in place.