Logic should account for session flags

[rhelmot]

randomly dumping my thoughts out here

• huge mess switches are the most impactful flags which affect traversability
• pathway should use logic similar to key placement that if something needs a flag set, the logic will try to place elements bequeathing that flag
• labyrinth and pathway both should probably just keep track of what flags are required to be set/unset and if a new room contradicts the current flags then it can't be added but if it doesn't contradict then we get the flag added to the session
• we should probably edit levels so that you don't have a choice whether you trigger the flag or not, i.e. block towels switch top route with some towels
• similarly, "local" flags for temple switches should be accounted for on a per-linkedroom basis

[rhelmot]

All this is done except for the "local" flags