fix for coop

wisps will spawn only for unvisited S, SS and US rooms

- Added co-op support (for USR hints).
- Increased duration of wisp colors (3x).
- The mod now spawns multiple wisps if there are multiple entrances to S or SS rooms in the current room.
- USR hints are now available only if the player has the Repentance DLC.
- USR wisps now spawn near the wall where a Red Door should be created.
- Improved USR detection.

- now crawlspaces detection should always be accurate

- Mod Config Menu: added an option to always spawn wisps.
(^^^that basically sets all the other settings in the right way in one click... so you don't need to set all the probabilities all by yourself).

- added an option to disable the spawn of the wisps only if it is the first time you visit a room.

- now the wisps will spawn only if it is the first time you visit that room

- base probability for all wisp is now 25% (before it was 10%)

- fixed wisps accumulation when the player enters/exits the room multiple times
- better code

- now wisps for Crawlspaces spawn near the rock you should bomb