mock @N0 correctly
first convert loop sketch
implement plane switching
ignore G64
handle M3 S3000
mock D commands (speed setting) correctly
handle speed setting (M3 S...) well
ccw spindle speed setting (M4)
handle M5 (spindle off)
add M3-M5-M3 test
fix W-behaviour on spindle speed change; added more tests
coolant handling (M7, M8, M9)
fix spindle switching while coolant is on
allow to set feed rate (F1 etc.)
conversion improvements/similarity
implement g-code import button