Implement HW5 ESC Setup / Forward Programming (#114)

* hd - pl5 - hw5 / pl5 ported to rrfsm

* hd - pl5 - added: device info & get params req, extended decoder for additional responses, pack param payload for MSP editor

* hd - pl5 - enter MSP editor from tele

* hd - pl5 - added writeparams req, resp, err

* ESC Setup - param - OOB status (restart needed) and device identification

* hd - pl5 - added OOB restart + identification, cleanup

* pl5 - pre-pr code cosmetics, removed deprecated hw5

* pl5 - rrfsm - change callbacks to accept Us (vs Ms) to support protocols like HW5 that need to see the higher resolution timer

* pl5 - more pre-pr code cosmetics, removed debug/test

* pl5 - pr - timeUs_t and fn(void) usage addressed