SnatcherBugFix

Attempts to fix a couple of bugs related to snatchers/pouncers:

1. Forces removes the screen effect when the player is not in the arena dimension. The check is run every 2.5 seconds after the screen effect is applied or a pouncer consume request is receieved, and stops when the screen effect is removed.

• Also force exits any open menu pages when the screen effect is applied or removed.

1. Force teleports out of the arena dimension. The check is run every 8 seconds after being consumed or entering the arena dimension, and stops when the player is no longer in the arena dimension or the snatcher dies.
2. (Host-only) Force despawns any enemies that spawn in the arena dimension.

Thanks to Auri for the patch help from TheArchive, and Dinorush for the delayed callback code from EWC. Also big thanks to Tsopu and ThyUnsuspicious for help testing.