Add subdirectories for grouping net-related functions.

Connect client to server, save connection details.

With the help of the test client app, the real client is able to receive
messages which are transmitted through the server.

Attempt to connect client to server.

Isolate network logic to each subsystem.

Update initialization method.

The client app is able to connect to the server, however no further
communication is happening. Must've been the callbacks?

Also the client app enters into an infinite loop when lws_service() is
called inside the game loop.

Add libwebsockets client to game executable.