Miserable Users

Added a command for managing miserable users and the following configurable miserable actions:

• 
  
• Chat fail (stops the user's message from sending)
  
• Disconnection (randomly sends a legitimate looking java disconnection message)
  
• Interact remove (destroy blocks they interact with)
  
• Subtract one of their item stacks in their inventory by 1
  
• Make them "lag back"
  
• Spawn a mob on them (different in all dimensions)
  
• Don't place their blocks
  
• Silverfish spawn upon breaking blocks