Launch hotfixes

We've heard some people had issues with the game not closing cleanly, having Steam think the game was still open. So we're pushing a potential fix for this!

• Fixed an issue where Steam would think the game is still 'running' even after it was closed for some users.
  NOTE: This could also help with some people experiencing issues with their save files (as they might've been lost when the game didn't properly exit).
  
• Replaced some placeholder icons in the UI.