Build 8486
SVN-
Fix crash issues when Track sprites are set up incorrectly
SVN handles and Git names are merged into one person.
Fix crash issues when Track sprites are set up incorrectly
Sanitize all uses of wall.nextwall to prevent OOBs
Copy the sln==1 GetUpperLowerSector case from the editor to the game
This avoids upper and lower remaining unmodified. Sector 469 in Seppuku Station causes it!