SickRage-1

Remove duplicitous self.enabled definitions
Remove some unused imports

Remove findPropers override from HoundDawgs
More cleanup in HDTorrents (imports)

Remove `public = False` from all private providers and make it the default

Remove findPropers override form the rest of torrent providers that dont need it
Clean up most unused imports, and redefined built-ins
Light linting on these files
Fix download_url in nextgen