Make app "listen" and smartly update when data is added/edited/deleted

[blimpich]

This'll do two things:

1. add ability for app to "listen" to changes on db, ie if someone somewhere adds a shipment it should show up on Jeff's table without him having to refresh the page
2. currently when you edit/add/delete a shipment, it sends that request to the db, and the app then requests the entire shipment table from firebase and then updates the state on the frontend. This should make it so that when a table is added-to/edited/deleted from it'll smartly update the state of the app instead of reloading the entire table from firebase.

This update will greatly increase the performance of the app and also greatly reduce the bandwidth of the app, making it cheaper to run.

[blimpich]

the only "good" way of doing this is by migrating over to cloud firestore, realtime database is too limited and is not designed for this type of applicaiton