Another attempt to fix nested parenting triggers
TriggerParent works like TriggerParentEnclosed since that should be much more robust when sorting out overlaps / nested parenting triggers
Simplified TriggerParentEnclosed (now inherits from TriggerParent)
Simplified TriggerParentExclusion (since overlaps are handled by TriggerParent)
Removed OnEntityEnter hack from ForceUpdateTriggers (since overlaps are handled by TriggerParent)