Add Ultiboard2 electronics. With PWM current settings. For the few people that have this new board as experiment in their UM-Original.
Added PT100 support for Ultiboard2
Merge remote-tracking branch 'upstream/Marlin_v1' into Marlin_v1

Merge upstream changes
Merge branch 'Marlin_v1' of github.com:Cylindric3D/Marlin into Marlin_v1