added skipItem(), added skipEntityMetadata(), added 0x0D & 0x0E
add 0x0F, 0x10, 0x11
added 0x12, 0x13, 0x14, 0x15, 0x16
only sent packet back if size > 0
added 0x17 -> 0x23
added lockChest()
added 0x24 -> 0x33