WIP and very much under conststruction, beware!

The changes done to printer.cfg files:

• speed up homing (40mm/s => 100mm/s)
• alter sensitivity during homing, homes with less noise
• use back left corner of the movement envelope
• alter Z homing for faster movement

credits:

• Thanks to https://github.com/DaNinjaSmurf for beta testing this on X plus 3