* trxcon: abstract L1CTL codec from the l1ctl_server API
* trxcon: use L1CTL_HEADROOM in l1ctl_alloc_msg()
* trxcon: move trxcon_inst_{alloc,free}() to a separate file
* trxcon: move l1sched_logging_init() from l1sched.h to logging.h
* trxcon: cosmetic: s/trx_log_init()/trxcon_logging_init()/
* trxcon: cosmetic: rename trxcon.c to trxcon_main.c