Laser gCode

It is a pretty simple exercise to convert milling G Code to laser G Code.

Turn off the laser (M5) for G0 movements and turn on the laser (M3) for G1 (also G2 and G3) movements. May as well delete all the old M3, M5 and Z movements as they will be redundant.

I will add a "-L" or -"l" to the command line options for "laser code".

AlanX