my first commit and change to smb1r, i hope things are working alright
- 9-1a: added missing elevator platform at the start
- 9-3: L pipe is now accessible and sends you to coin heaven like the original (however i hope walls and the hardcoded thing cooperate...)
- 9-3: fixed a missing staircase tile near the end, probably removed to be easier but its part of og level design so...
