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Some of the existing Agent types have already stopped working and need to be either deleted or updated, but currently, Huginn is very awkward at obsoleting an Agent type. If a Huginn database had any existing instance of the type, deleting the Agent implementation could render the entire Huginn server dysfunctional because Huginn uses STI where retrieving an Agent record with a non-existent type will immediately cause an error.
This PR provides a way to "archive" agents by converting them to a new Agent type called "ArchivedAgent" with all states and configuration options saved. Once an agent is archived, it is disabled and becomes dormant. The archiving is intended to take place in database migrations so deleting an Agent type wouldn't cause trouble to users.
Archived agents could be unarchived someday when a successor Agent type got ready.