Add access/mutator for bridge information.

Define enum class for tor's status and define current state using
the enums.

Correct indentation and add restartTor() function

Minor improvements

Rename localBroadcastReceiver as persistentBroadcastReceiver such that
it isn't confused with the checkIsTorStarted receiver.

Move TorController's BroadcastReceiver registration into
FenixApplication because TorController misses events when
registration is controlled by HomeFragment.

Initialize tor-android-service with FenixApplication's Context.

Bug 40044: Fixup Connect screen

Add settings cog

Bug 40044: Fixup Connect screen

At the same time we adapt MOZ_BUILD_DATE to our needs where it is
actually used and not in tor-browser-build. This gives us more
flexibility. See: tor-browser-build#40084.

With the corresponding android-components patch, this allows all `startActivity`
that may open external apps to be replaced by `TorUtils.startActivityPrompt`.