Add config screen with Bonjour server lookup

I did not want end users to mess with hosts, IPs,
or ports at all so I implemented a config view
that uses Bonjour to search for servers offering
OSC over UDP.

The config screen is currently a dead end for the
app if there are no servers available. A future
commit will need to provide a way to exit this
screen without making a selection.
Rename channels to 1-4

Just plain easier than shapes.
Separate distinct gate message

Clearly separates the x/y positions from the touch
up touch down messages.