- Makes Basic build mode warn you before you delete the ground and space everyone
- Makes Basic build mode turn the turf you deleted into the base turf for the area. If area is not available, it goes with the base turf of the Z level.
- Makes Advanced build mode start with Null. No more spawning lockers and qdel()ing players!
- Fixes a longstanding bug where if you cancelled selection in build mode and then tried to select something from the list, it defaulted to a locker. Instead, if you cancel it, it defaults back to null and lists work like normal.
fac651dee9