Add gcode generation

[mrghosti3]

TODO:

• Generate simple line gcode instruction #5

• Generate gcode instructions for drawing a triangle made of simple lines #6

• Test out advanced triangle dxf to gcode #7

• Generate simple point gcode instruction

[mrghosti3]

Decided that gen_gcode crate is not really what I'm looking for my use case. Started working on my version. Will put a link here after I'm done with cleaning it up and uploading to gitlab.