Options for selecting which columns are visible in the game list.

Also added optional extra column, game ID, disabled by default.  also added a config entry to disable coloring compressed games in blue ("ColorCompressed").  I am resubmitting this because I changed a lot of stuff from the last pull request.  
![dolphinidcol](https://cloud.githubusercontent.com/assets/3501739/3124939/f3f712e4-e782-11e3-8510-272249ead6ce.png)
![dolphinidcol2](https://cloud.githubusercontent.com/assets/3501739/3124940/f3f8271a-e782-11e3-944e-590af80d0e53.png)