Events cleanup (#592)

* Remove hardcoded background.

* Export events into the zap file.

* Do not include empty array keys in the zap file.

* Create skeleton function for event importing.

* Fix unit tests.

* Cleanup the attribute query.

* Import event data from zap file into the tables.

* Add unit test that validates that events are loaded.

* Return the event state in the session back to the UI as part of the state creation.

* Work the way up the UI to show event data.

* Properly display toggles based on what is loaded in the database.

* Fix the package-lock.json that was broken in an earlier faulty merge.