`Trigger.multiPress(N, T)` creates a trigger that fires when there are
at least N rising edges within the last T timespan, eg `multiPress(3,
Seconds.of(1.25))` for 3 rising edges within the last 1.25 seconds.
`Trigger.retryWhileTrue` and `retryWhileFalse` will continuously attempt
to schedule a command while the binding condition is met. This is
similar to `whileTrue` and `whileFalse`, but will reschedule the command
if it ends or is canceled while the binding condition is still met,
rather than requiring a new rising edge to reschedule it.
`Trigger.getAsBoolean()` behavior has been changed from passing through
the underlying boolean supplier to returning the latest cached signal as
determined by the most recent call to `poll()`. This allows rising and
falling edge triggers to have a consistent return value over an entire
polling cycle, rather than only being high for the _first_ check in a
cycle.
Closes#8309
