Support of Mark II Power Loss

[andrivet]

Feature Request

• [x] Your request is not specific to your setup but can benefit to many people
• [x] You have checked that you are not creating a duplicate of an existing (maybe closed) request (use the search)
• [x] You have provided a short but meaningful title
• [x] You have provided enough information (such as links to web sites, blogs, technical description) so that anyone can understand what you are talking about. Just any only a title is not enough.
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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++