Reducing build height is now possible in castle view

🛠️ Improvements:

• A new button in the castle view now allows you to flatten the walls, making it easier to place units.

  

• Resource carts now display the amount of resources they contain.

  

• Clicking the door in the bottom left corner now opens a dialog asking whether you want to exit the game or return to the main menu.

  

⚖️ Balancing:

• Resource carts now have a significantly higher minimum amount of resources.