* Add background fetching to server_proxy
* Update UI to use server_proxy fetched jobs
* Fix issue getting status with empty jobs_cache
* Fix issue with jobs not appearing after switching servers
* Remove job_cache from dashboard_window and utilize server_proxy caches
* Remove jobs from table that shouldn't be there
* Streamline how we're handling offline tracking and handle connection error when fetching thumbnail
* Add ability to remove any manually added servers
