(^) unisgned char => byte (also char=>byte, where wrong)
(-) bug: input call did not accept non-"int" number types (byte,char,etc)
(^) `delay´ => `recursive´
(+) automated Makefiles
(^) shell/tst2 => serial_shell
(^) automated Makefiles
(^) use CEU_IN-x for input events
(+) ISRs
(+) ceu_init