Items, Begone!

Added basic server-side checks.

Attaches a check function to the following events:

• AttackBlockCallback.EVENT: Called when left-clicking (“attacking”) a block.
• AttackEntityCallback.EVENT: Called when left-clicking (“attacking”) an entity.
• UseBlockCallback.EVENT: Called when right-clicking (“using”) a block.
• UseEntityCallback.EVENT: Called when right-clicking (“using”) an entity.
• UseItemCallback.EVENT: Called when right-clicking (“using”) an item.

If any of these events show a player has a 'blacklisted' item, their inventory will be cleared (via dropping or deleting) of any items that also fail this check.