Hands Off My Book!

The code in the PlayerInteract event had some duplication, and I hate duplication so I reworked it a little. As a side effect of that, the "added" and "deleted" message entries in config.yml need to be changed to "add" and "del" respectively if you already have a config.yml generated. Also noticed that one could do /homb add then /homb del and you'd end up in both lists, and it could cause conflict down the road so made it check if you are in either list when trying to mark. If you are, you must complete that marking session before starting another.