feat: Batch import of all pokemon stored in save file boxes

[Violins77]

Similar to how PKHEX does it, a simple button to dump all boxed from a save file in the home. This would a lot of drag and drop for games with hunders of pokemon to transfer.

The operation should also work in reverse: A simple button to import all bank pokemon to a savegame. Although I understand this might be more challenging because of the generation handling and some pokemon not existing in all versions...