Callbacks

[Cam-Jackson]

Please enable Callbacks, so that timer values can be changed, while the counters are running.

While in an interrupt routine, I cannot even stop and restart a timer with a new value. This makes it impossible to synchronize the timers to another event..

[budryerson]

If I knew what "Callbacks" were, I'd rewrite the damn library myself.
Please let me know if you do.