Use the serial number from the Pi or a random number
the HELLO from client to server no longer sends old team and player.
Start propogating all events from the gameState, not the model.

Also, rationalise where we cast from str to int after parsing from a
message
emit dataChanged with what I think are the correct values.
update TODOs
delete the "ghost" player when a pi restarts the client process.
add TODO