Added progression to building crafting

This is something that has been requested quite a lot, and now it's done! When you buy a building, such as a house, it will increase the cost of the next house you want to buy.

This system also applies to destroying a building. Using the house example again, when you dismantle one, it will reduce the amount of resources needed to build another.

Also, I’ve fixed two related bugs :

• Now, if you try to build a building in the spot where the crafting menu is located while the menu is closed, it will no longer replace your building with the one from the crafting menu.
• Now, when you want to sell a house, you can do so even if it would bring you to your maximum villager capacity. For example, if you're at 5/10, you can sell one house and go to 5/5.

I hope you’ll enjoy these changes ! They’re meant to work properly in multiplayer and are compatible with the save system. Please note that your current save won’t reflect the correct construction costs — only your next game will.