See #28

Introduce command to delete events by ID or action

See #28

In CLI output, indicate if job is an Internal Event

While the `a8c` prefix is currently a giveaway, that may not always be the case.

See #28

Job execution buffer has proven unnecessary, and just wastes time

Remove event timing that doesn't work

Fixes #29

This is a bit vestigial. At some point, I thought there'd be more to do between queueing jobs and running them.

Fixes #43

Set the `DOING_CRON` constant as early as possible

In particular, the `DOING_CRON` constant should be set before any client code is loaded.

Fixes #44

Introduce CLI commands to view plugin data

See #32

Just needs the event data itself to be filled in

Add a description for the one-time fixers set of commands

Introduce command to flush plugin's cache