Using global variables for this is bad, and it didn't even catch all cases. Now a node build is only considered successful if everything is set up successfully.
# Conflicts:
# src/maploader/maploader.cpp
If we ever want to refactor the global level data these must not reference the 'level' variable.
The main parts of the map loader cannot use this information, because it can only be created after running the node builder, so it got its own set of index functions instead.
Since the SpawnedThings array is still available when polyobjects are spawned it makes no sense to create an expensive linked list in P_SpawnMapThing.
This can be done far better by scanning through the array again and collect all matching items in a second array.
