Added Easy Load Menu Options

These are adapted from this version:
https://github.com/lajos/Marlin/blob/tantillus/Marlin
Disable Easy Load by default
Support the PanelOne controller

This is a simple Open Source LCD controller for RAMPS that is
distributed with the Think3dPrint3d Mini Kossel kits.
Merge remote-tracking branch 'origin/PanelOne-Support'