Server/PacketIO: Updated CMSG_MOVE_SET_CAN_FLY, SMSG_MOVE_SET_FLY_SPEED, SMSG_MOVE_SET_RUN_SPEED, SMSG_MOVE_SET_SWIM_SPEED, SMSG_MOVE_SET_WALK_SPEED and SMSG_MOVE_UNSET_CAN_FLY opcodes.