Clock in Overlay

Simple clock in Overlay, shares Font and Color settings from FPS Counter.

Settings preview:
![Konfiguracja_Mumble_2013-03-01_20-34-55](https://f.cloud.github.com/assets/521035/211088/1817ff70-82a9-11e2-90c2-d67c39b2d8af.png)

In game preview:
![2013-03-01_20-37-38](https://f.cloud.github.com/assets/521035/211080/b4f457e0-82a8-11e2-86e1-1792546cd78e.jpg)