Summary:
Changes the delta code to handle new deltas on the Account object,
which are triggered by changes in sync state indicating various backend
issues. Saves the sync state in a new field on the Account object, which
is persisited in `config.cson`.
Includes several UI changes to display more information when an account has
backend sync issues. Adds better messages and new actions the user can take
based on the type of sync issue.
Additionally, fixes bug in action bridge that was preventing multi-arg global
actions from working.
Test Plan:
Manual, by testing different sync state values and triggering deltas from the
backend
Reviewers: juan, evan, bengotow
Reviewed By: evan, bengotow
Subscribers: khamidou
Differential Revision: https://phab.nylas.com/D2696
