Specifically, I added code to send a message from the client, after the client is launched. This message is used to try to connect to the server. Once the server receives this message, it responds back. After the client receives this response, the connection has been established, and the game can begin.
I also added code to wait (on the client side) for the server to press the spacebar.
The agnostic struct consists of a 'Mode' enum, and a 'Sock' type. The
'Sock' can be either a Server or Client, depending on the type of game.
This allows polymorphism, as I don't have to worry about whether the game
is being run in Server or Client mode, and I can call the same methods regardless.