(^) ceu_go_* => ceu_sys_go(app,*)
(^) ceu_out_wclock => ceu_out_wclock_set
(^) ceu_sys_emit "fill" w/o recursion
(-) self-emitted events (now they are calls w/ ceu_go_*())
(^) pid => uint pid
(^) __ceu_gc to synchronize apps termination
(-) ceu_sys_stop() (use ceu_sys_go)
(^) int/noInt => ISR_ON/OFF
(^) clear queue on every pass
(^) pid => app