Reflex::Role::Interval has method_start documented but not implemented.
Using "auto_start => 1" it works fine, but with "auto_start => 0" there
seems to be no way to start the timer.
I'm trying to run a whole bunch of Interval timers, up to a couple
thousand, and as quite a few will have the same interval I don't want
them to expire all at the same time but spread out a bit. I thus need
them to start after a random delay that I'm trying to achive with a
temporary Reflex::Timeout created in BUILD and then disposed of after it
has fired and started the Interval timer.