Implement commits for difficulty event_flags. Explanation below.

If creature has all four difficulty flags, it will add '(Dungeon & Raid Only)'.
If creature has both dungeon (normal/heroic) difficulty flags, it will add '(Dungeon Only)'.
If creature has either of the dungeon (normal/heroic) difficulty flags, it will add '(<difficulty Only)' (so 'Normal Dungeon Only' or 'Heroic Dungeon Only').
If creature has both raid (normal/heroic) difficulty flags, it will add '(Raid Only)'.
If creature has either of the raid (normal/heroic) difficulty flags, it will add '(<difficulty Only)' (so 'Normal Raid Only' or 'Heroic Raid Only').