New cards: spells and items

Since my last update, I worked on the AI; improving it, and I added tests, to make sure the game doesn't crash. This doesn't sound like a lot, but it is! I can now simulate games by having two AIs play against each other, which is super cool development-wise. I can gather stats about balance and make sure the game is fast enough and (a part of it) doesn't crash. Unfortunately there's nothing to show visually regarding these topics 😸

I did however, add visual stuff. I added the support for spells and items cards. Here's a classic one on the right:

And here's another one for the undeads:

which is more fancy, since it applies to all the player's creatures on the board at once (so far cards were applying to a single spot). Here's how it looks when dragging it to play it (unfortunately the card being dragged doesn't show in the screenshot, there's only the pointer 🤦‍♀️):