Add Orbot and Default F-Droid to sync via Tor

[drGrove]

Orbot should be a system package as we advocate for privacy and security.

We can also kill 2 birds with one stone and ensure that on the first download of the repositories is already through Tor.

[lrvick]

We just need to be sure that if you have an old version of orbot built-in that fdroid can auto-update it.