Filter Jetpack Sync post-type blacklist to ensure plugin is always excluded

Since plugin's data changes frequently and is only valuable locally, exclude it from Jetpack Sync.

Fixes #86

Introduce CLI command to retrieve event queue from REST API

Fixes #78

Don't deadlock the individual-events lock when the global lock blocks an event

This bug was introduced by 5337e4ab

Check the event-level lock first, ensuring Internal Events are locked at only the event level

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

Fixes #76

Limit an event's domination of the queue

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.

If an event has no callbacks hooked to its action, skip it

Filter is available to bypass this

Fix timeouts on event-level locking

Setting one in minutes and the rest in seconds is just going to cause issues, such as in f21fdc8d.

Add event-level locking

Remove legacy scheduled event cleanup

Any sites running the plugin would be cleaned up by now, making this cruft.

Fixes #62

Miscellaneous and trivial CLI improvements

Corrects a bug introduced in ad4a5420
Fixes #67

Fixes #40

Fixes #47

Also stops the command from displaying an empty table if there are no events for the page

Fixes #67

Reduce number of posts processed by each run of our Internal Events

The events run frequently enough that smaller batches are fine. Will also reduce load from these events until #63 is addressed.