Call other mods' OnReleased() and OnLevelUnloading() before exit

[algernon-A]

Some mods perform significant actions, including saving of configs/game state on exit. These mods should be allowed to perform their OnReleased() and OnLevelUnloading() methods before the game is killed.

[algernon-A]

For added bonus, time them so we can see if there are any particular problem mods.