Make Battle/DoubleBattle pickle-able
#821
Open
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Requires #822
It's nice to be able to serialize/deserialize objects so you can store them in files and save your current situation. Now you can do that with Battle and DoubleBattle objects! Battle-related objects no longer store a _data field containing GenData, and instead just call GenData.from_gen whenever they need the pokedex or something. This does not lose any performance and we were already doing this in some places, but allows these objects to be pickled now that they aren't carrying a pointer to the giant GenData object.