Bank Module - Save order history and raw difference

[symt]

We want to move the order history and raw difference out of the BankCalculator and into the BankModule so it can be saved. The refactoring should be done automatically to make things easier and to not mess up any references. Also, given this move is happening, the reset method in the bank calculator probably isn't needed and can just be merged with the BankModule's reset method.

Once complete, in combination with @Cheezer1656's implementation of importing orders from the order menu, will allow pretty much everything about the bazaar's state to transfer across minecraft sessions.