If an event callback fatals or times out, it can deadlock. By catching the fatal (PHP 7+), deadlock is avoided.

Fixes #105
Fixes #117

Most events, due to alloptions inconsistencies, cannot run in parallel. Certain events, however, may be acceptable.

Fixes #106.

If code is loaded conditionally when `DOING_CRON` is set, not setting it for all of the plugin's REST endpoints can lead to unexpected behaviour.

For example, duplicate events can be created infinitely, in combination with the skip-empty-event functionality.

Fixes #97

Updates all of the plugin's core classes to use the new event store, primarily through the helper functions I should've introduced in the first place.

Still need to update tests and CLI commands

Fixes #78

This bug was introduced by 5337e4ab

Also avoids an event-level lock check failing, which would've wasted a space in the global lock for the current period.

Fixes #76

Fixes #56

As a result, Internal Events were subject to the queue limit, when they shouldn't have been. Explains why the force-publishing failed for at least one beta tester.

Filter is available to bypass this

Just like Internal Jobs, they shouldn't bother the lock status