HarderMobs

Added The "DeveloperMode" in the plugin which allows me to see the following information:

• The chance of the mob taking the item in hand
• What entity was attacked
• Who was attacking the entity
• The difficulty of the server
• And if the plugin is enabled

I have put the "DeveloperMode" in so that if you have any problems, I can quickly see what's gone wrong. If you don't want me to be able to see these details, turn the "DeveloperMode" in the config to false.