Build hands pre-battle

Replace the concept of building a hand from the menu, and showing the "your hand does not contain 5 cards" visual message. Instead, use the suggested approach of building the hand pre-battle, just like in the original game. However, to bring about an improvement, the chosen hand should be remembered between battles, to speed up battles when using the same hand composition each time, but also making it easier to fill the hand when cards are lost, or modify a hand when new cards are found or the opponent requires a different tactic.