Support for UID/GID and new/updated providers

Took some time, but I finally got together a new release after several contributions to the repository.

NordVPN, Newshosting and HideMyAss have got updated configs. New providers are SmartVPN and Windscribe.
In addition to this a long standing feature request to support setting UID/GID for the user running Transmission has been added. This means the downloaded files are no longer owned by root if specified.

Thanks to all contributors! Especially @pkishino for taking an interest and solving several provider requests and @ammmze for adding the highly desired UID/GID fix.