app(rework): dataflow

[axtho]

currently we have a "fetch from HTTP" => "save in store" strategy
In order to accommodate real scenarios and to make rehydration easier we should rework the dataflow like this:

ACTION => attempt HTTP call => (onError: => INSERT ACTION into Sync Queue) => (on Success) => update ClientDB (localforage, RXDB, ngrx/db, PouchDB ...) => UPDATE STORE

This enables offline scenarios and data syncing by replaying the actions from the SyncQueue ({action: "", payload: ""})