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/exceptions/EventConstructionException.java

@@ -0,0 +1,24 @@
+package mock.exceptions;
+
+/**
+ * An exception thrown when we cannot create an {@link mock.app.Event}.
+ */
+public class EventConstructionException extends Exception {
+
+    /**
+     * Constructs the exception with a given message.
+     * @param message Message to store.
+     */
+    public EventConstructionException(String message) {
+        super(message);
+    }
+
+    /**
+     * Constructs the exception with a given message and cause.
+     * @param message Message to store.
+     * @param cause Cause to store.
+     */
+    public EventConstructionException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

racevisionGame/src/main/java/mock/exceptions/SourceIDAllocationException.java

@@ -0,0 +1,24 @@
+package mock.exceptions;
+
+/**
+ * An exception thrown when we cannot allocate a source ID.
+ */
+public class SourceIDAllocationException extends Exception {
+
+    /**
+     * Constructs the exception with a given message.
+     * @param message Message to store.
+     */
+    public SourceIDAllocationException(String message) {
+        super(message);
+    }
+
+    /**
+     * Constructs the exception with a given message and cause.
+     * @param message Message to store.
+     * @param cause Cause to store.
+     */
+    public SourceIDAllocationException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}