Add support for multiple workspaces to Dantes Updater

[flemingcaleb]

Update Dantes Updater to support multiple workspaces. This should allow separate update schedules for each unique workspace. (Maybe store schedule in db to persist through shutdown?)

[flemingcaleb]

Due to the addition of a separate update plugin in #21 Dantes Updater should no longer be required to store separate update schedules for each workspace.