Fix next-forced-exclusive event time calculation

Jump the time forward (in 24-hour chunks) to find the next date/time the event will run rather than just adding 24-hours and assuming it's an event that runs every day (of the week or month) at a specific time.

Also, expose the next-run-date/time for an event as a new `next_run` property for `xtrn_area.event[]` (in `time_t` format) for easier debugging of these kinds of issues.
Also expose the error log level as a new property: `error_level` while we're here.