This reverts commit 7e881afb638ccc0dbcfc7b539fc152dc923d63e1, reversing changes made to 9d78e4f72a4c6ff459fc386b2f25beae40b94429.
schedule_*event
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`.