New Update! Level editor and music

Hey, happy holidays! This update should resolve the music looping over itself after you die a few times in a row, and adds a Create Level button to the main menu, so that you can more easily create levels to be shared with your friends.

Remember that in order to upload the Custom Levels to the Steam Workshop, you must first save the Custom Level, then from Level Select > Custom, you choose your created map, then select Upload to begin silently uploading it to the Steam Workshop, where it will be made public shortly thereafter.

If you don't see it show up on the Steam Workshop immediately, make sure you're filtering by your own levels, because sometimes it takes a minute for the Steam Workshop to catch up. If you want to try someone else's levels, it's as easy as subscribing to their Workshop Level through Steam, and then the next time you boot up Roguebreaker, you'll see it in your list of Workshop levels.

I also removed some non-beta branches that were no longer useful. If you were still on them, you should be transitioned over to the main public branch automatically.

Thank you for all the generous reviews, each one makes my day!

Enjoy the holidays!

• Added Create Level button to the main menu
  

• Fixed background music sometimes looping for certain people after they die several times on a single level
  

• Tweaked panels in the Level Editor screen, and removed some gray corners.
  
• Tweaked Main Menu buttons so that they're not offset by a single pixel depending on how far down they are in the list