Save & Load MUL

[WEKarnesky]

To extend the usefulness of Battle-Force-Balancer, we should save and load MML's MUL files (collections of mechs) so we can create teams, save them, then load in MM. Or Take teams from MekHQ and then load in and print in BFB.

I think this requires that #35 be done first, but research is needed.

[Algebro7]

We actually have a MULParser already, but after talking with Hammer it sounds like we need to update it to handle new fields that have been added. I'll close #150 as a duplicate