Provides a checkbox in the settings view, as well as an event handler to
disable/enable the tor network if the device is not on using the wifi
connection.
Refactors network-enabling code to a separate function. This function
is ran after the network state changes, or the settings change and
will update the status accordingly.
Tor has a controller command, TAKEOWNERSHIP, and a configuration option,
__OwningControllerProcess, that work together to ensure Tor shuts down
when the controlling process dies and/or disconnects from the control
port. By using them we can avoid creating runaway Tor processes that
have to be killed with hacks.
