Timer delay zero should fail

[edibblepdx]

Delaying the timer zero cycles blocks until the timer overflows because the COMPARE event is not immediately raised. Setting a zero delay is not often intentional and should fail either through panic or result. Alternatively, start the timer for a minimum of one cycle.

Currently at 1MHz timer frequency and 32-bits of accuracy, setting the delay to zero should actually delay 4294.97 seconds, or roughly 1.19 hours. Do note that I haven't actually tested this.

[BartMassey]

I incited this issue 😀 . I think the "minimum 1 tick delay" idea is a good one. Whatever behavior we end up with should be clearly documented.