Add a Battle Memory type thingy

[Lamby777]

Should remember all the foes you've battled and allow you to queue up a "virtual" battle against them any time. I want to make this way better than the one in Mother 3, though. It should allow you to customize your inventory layout, whether or not the enemy can fight back, damage percentages, stat changes, etc. It should basically be creative mode but earned through discovery of enemies. It's like a reward for players who explore the game to its fullest.

[Lamby777]

This, along with the scrapbook, is slowly being developed over time rn.

[Lamby777]

The type definitions are there, but in order to actually implement anything useful, I need to first write the code for ending battles, and to do that I need to first write the code for dealing damage properly instead of failing every hit. ;-;