Freetube: Bring back the tor connection option

[stemy2]

Important note
Please check other open and closed issues for a similar feature request before proposing a new one.
Also please leave all headers except this one in the issue, so that it is clear what belongs where.

Is your feature request related to a usage problem (not a bug)? Please describe.
Before the rewrite, we had the possibility to use a connection through tor, and i used it myself frequently, but It's not available anymore.

Describe the solution you'd like to see implemented
Reimplement it in the rewrite.

Describe alternatives you've considered
Nothing, i'm not into technical details, so i can't really looking for alternatives.

Additional context
Add any other context about the feature request here.

[GilgusMaximus]

Hi, so this is planned for the future and already in the roadmap for 0.10

[Vetgans]

I suppose the normal (i.e. non-TOR) proxy connection will be brought back with this as well?

[PrestonN]

Functionality will be similar to how it was before the rewrite. So Tor / Socks5 proxies will be supported.

[Frick-David]

2nd!