Bugfixes

Bugfixes ready for the weekend :)

• Level-Up Button never covers Items or Monsters (Ines, snek, Christian)
• show game duration in win-screen
• fix Dungeon Seed compatibility warning sometimes falsely showing up (snek)
• when starting out on the main game, show message “Defeat the Dark Lord to win the game”
• fix Magic Hammer despawn (snek)
• add social media