Add new watchdog API, WatchdogRTT, as a RT clock (with low precision) but no events.
Add new watchdog API, WatchdogRTT, as a RT clock (with low precision) but no events.


jfpoilpret/fast-arduino-lib,jfpoilpret/fast-arduino-lib,jfpoilpret/fast-arduino-lib,jfpoilpret/fast-arduino-lib