Three new lag exploits

• Limit falling blocks in a chunk, prevents any falling blocks from falling if there is more than 50 falling blocks in a chunk.
• Limit experience bottles, prevent having a shit ton of exp bottles in one chunk then loading it to kill the server
• Prevent projectiles such as xp bottles and snowballs from going through portals, this can cause a shit ton of lag especially if there is new chunks on the other end, this wont prevent mobs or items