velocity controlled extruding update

I've added a component and updated the configuration files for correctly calculating the cartesian velocity instead of the joints velocity. Temporary solution until it's possible to read the cartesian velocities via HAL pins. This component is directly taken from the lineardelta kinematics file.

Update of scripts needed for changing the slicer g-code output for use with velocity extruding. Added the author.py and g1tog23.py from the linuxcnc website to have all the prerequisite in 1 place.