iCal fixes

Fixed: Calendar feed modal
New: iCal URL now contains the API Key
Fixed: webcal url now has the apikey embedded to support more third-party webcal clients.
Fixed: Updated check for hashed releases.
Fixed: NzbDrone running on Windows should no longer fail while getting a very long path from a sabnzbd running on linux.
Fixed: Manually marking a release as failed will now also remove it from the queue in drone and, if enabled, remove it from the download client.