On some networks or some mDNS implementations child discovery may not
work well. As an alternative, allow a parent to connect to a device
directly with an IP Address and port.
The previous approach was to list buttons in a TableLayout.
However, this approach does not work well if there are more
items than can fit on the screen.
To allow scrolling of items, and also a better presentation
of said items, use a ListView.
If the screen turns off, the child device will be unable to
record from the microphone. Keep the screen on in the monitor
activity to keep microphone on.
This commit adds the shell of the MonitorActivity. This activity
will register its service on the local network, wait for a connection,
then send audio data.
The StartActivity is the first activity which will be launched
in the baby monitor, and in the future will list the two main
options: become a monitor or a listener.
