come up with nice way for plugins to specify extra commands they want to create #27
Description
Plugins (like the google calendar plugin) should have an easy way of specifying commands they want to be made available to be able to be run on the CLI.
For instance, in #25 I've added break-time google-calendar list-events and ignore-event commands, but I did this in the hackiest way possible.
There should be some thought that goes into how to make this work better with the opts.rs file aware of the commands specified in each plugin.