1.2.0 Update

I've updated One Box, Blue Box to 1.2.0! I'm amazed it's been nearly 5 years since 1.0!

Nothing too major, but still, some improvements. Here's the changelog:

• Added level numbers
• Improved level 9 (Actually feels like a puzzle now!)
• Minor graphic fixes
  
• Rearranged final levels to scale in difficulty better
• Removed too-long, non-puzzle labyrinth level
• Removed non-functional YouTube music (this is something that had to be removed from all PuzzleScript games because YouTube made changes)