Added Menu music, crash fixes

- Music friend didn't like that the menus were quiet, so he made us menu
music
- Fixed a crash related to the elevator on the first level
- Fixed the fuel on level 2 going down too slowly, and on 4 too quickly
-renamed levels 4 and 5 and added them to build settings
- fixed run button disappearing on s3, 4, & 5
- fixed rover going over UI on s4 & 5
- doubled available arrows on s5 to make it possible.
-Implemented pushable rock