(make_lispy_event): Timer event is a list, not just cons.

(make_lispy_event): Timer event is a list, not just cons.
(timer_check): When DO_IT_NOW is true, handle events by running
the definition of timer-event.  Don't get the current time if there
are no pending timers.  If an event was generated, return 0,
If all timers were handled, return -1.  Add gcpros.

(readable_events): Tell timer_check to execute events.