Add rate limiting to PacketPlayInUseItem as well

Also removes our toggle for Spigot's option, I doubt anyone uses it.

scripts/importmcdev.sh

@@ -68,6 +68,7 @@ import NBTTagCompound
 import NBTTagList
 import PersistentScoreboard
 import PacketPlayInUseEntity
+import PacketPlayInUseItem
 import PacketPlayOutPlayerListHeaderFooter
 import PacketPlayOutScoreboardTeam
 import PacketPlayOutTitle