Added functionality

Added in Sliceoptions: GUIdropdown to choose "tilt, slide, none", GUI
textbox SlowliftDistance
Added in Machineoptions GUI: Efeedrate, Xfeedrate, Yfeedrate,
ZSlowfeedrate
Added in Buildmanager: if G or M  then send to arduino. so only G and M
Codes are sent to arduino
Rework of GCodeGenerator: complete rework