* trxcon: fix trx_if_close(): delete TRXC timer if it's pending
* trxcon: ensure are TRXC/TRXD logging is using LOGPFSML()
* trxcon: trx_if_open(): allocate trx->fi as a child of trxcon->fi
* trxcon: cosmetic: remove the '_fsm' postfix in trx_fsm.name
* trxcon: cosmetic: rename 'trx->fsm' to 'trx->fi'
* trxcon: get rid of GEN_MASK macro, define it locally
* trxcon: cosmetic: rename l1ctl_link.[ch] to l1ctl_server.[ch]
* trxcon: rework L1CTL socket API to support multiple clients
* trx_toolkit/data_msg.py: legacy flag is only for version 0x00
* trx_toolkit/data_msg.py: introduce header coding version 0x01
* trx_toolkit/data_msg.py: implement header version coding