forked from ROMEO/nexosim

The `schedule_*event_in` and `schedule_*event_at` pairs of methods are each merged into a single overloaded method accepting either a relative `Duration`or an absolute `MonotonicTime`.
The `schedule_*event_in` and `schedule_*event_at` pairs of methods are each merged into a single overloaded method accepting either a relative `Duration`or an absolute `MonotonicTime`.