Added CSV rule export to OpenRA.Utility.exe

To help balancing the game using math instead of gut feeling.

![image](https://cloud.githubusercontent.com/assets/756669/3077489/5e9fab80-e42f-11e3-8bc6-45a87062280a.png)

This needs an extra semicolon, and spaces between them for it work with `column -ts\; foo-mod-rules.csv`.