WIP. Probably need to cherry pick stuff out of here.

Added ClientConnection and server-side handshake.
Added MessageSerialiser and Deserialiser.
#story[1095]

racevisionGame/src/main/java/mock/model/commandFactory/CompositeCommand.java

@@ -0,0 +1,25 @@
+package mock.model.commandFactory;
+
+import mock.model.MockRace;
+
+import java.util.Stack;
+
+/**
+ * Wraps multiple commands into a composite to execute queued commands during a frame.
+ */
+public class CompositeCommand implements Command {
+    private Stack<Command> commands;
+
+    public CompositeCommand() {
+        this.commands = new Stack<>();
+    }
+
+    public void addCommand(Command command) {
+        commands.push(command);
+    }
+
+    @Override
+    public void execute(MockRace race) {
+        while(!commands.isEmpty()) commands.pop().execute(race);
+    }
+}