Handle disconnects from the cab

[KevinSnyderCodes]

Noticed at Brewcade that when the computer got disconnected from the cab network, the stats would freeze up permanently until the program was restarted.

This should be handled better.

KQStream

• The cab sends out an "alive" message every 5 seconds. We can continue to expect this message within, say, 10 seconds of the last one. If we don't receive it, the cab has disconnected and we should try reconnecting periodically.
• There may also be a "disconnect" event that we're not handling. Should also try to reconnect at that point as well.
• There should be an option to disable the reconnect functionality (enabled by default).