Jmdns fixes and tor onion support

There are three groups of work in this collection of commits:

• improvements to the WifiStateChangeService and related activities like JmDNS to eliminate problems that happen when there are a lot of wifi change events.

• add rework the .net.Downloader stuff to add Tor support and lay the groundwork for Bluetooth support

• add support for repos on Tor Hidden Service .onion addresses