This is a bit more difficult than just reassigning pins as the usage
of the timers has changed to the point of using 16 bit timers where 32 bit
timers would have been ideal. This makes the use of the prescaler necessary,
and we need to cope with a different prescaler value being used on different
timers.
Also, implement a software watchdog to make sure that the main real-time
modules are actually being run. Provide a panic facility, also giving blink
codes to indicate the panic reason.
