* Adding CheckForFinishedDownloadInterval to config service
Changed TaskManager to use a configurable interval for CheckForFinishedDownloadCommand
* Adding new CheckForFinishedDownloadInterval to UI
Fixes#840
New: New releases that fail will be retried a second time after waiting 1hr (configurable)
Fixed: Blacklisting releases with the same date and vastly different ages
New: Download client UI matches other settings
Fixed: Prevent drone factory folder from being set to invalid paths/root path for series
Fixed: Switching pages in settings will not hide changes
Fixed: Test download clients
Fixed: Settings are validated before saving