Bugfixes, participating in "Improve My Game Jam 30" for a university course.

Bugs fixed:

• Building menu can no longer be opened while the inventory is open
• Inventory can no longer be opened while the building menu is open
• Day & Night cycle shouldn't get stuck anymore
•  Campfire can no longer be used while it hasn't yet been placed in build mode
• Campfire cook menu can no longer be opened while it is already open
• Crafting now refreshes available crafting materials in the crafting menu