Support of Mark II Power Loss

[andrivet]

Feature Request

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Detailed description of the feature request:

Wanhao Duplicator i3 Plus Mark II has a unique feature: be able to recover a print after a power loss. It is currently not implemented.

Related to #172

[andrivet]

For information, I just ordered directly from Wanhao one of those Power Loss Resume module. It should help me add this feature to ADVi3++

[abzman]

All this board does is detect loss of AC power some fractions of a second before the capacitors on the DC side of the power supply run out so it can save where it was before it dies. Must be a real quick save to sd card or eeprom of the gcode line it was on or something like that