Fix/hidepasswordgames

Sheeo: needs to go after new-patcher and fix-travisbuild


Add a little checkbox, that hide games with password

before:
![image](https://cloud.githubusercontent.com/assets/1217999/4801569/7ada4942-5e35-11e4-9c96-81afa3191c77.png)

after:
![image](https://cloud.githubusercontent.com/assets/1217999/4801573/83e31fd2-5e35-11e4-972d-aa02050e35b4.png)


TODO:
* filter coop games if you hide pw games and then active them
(Tester TLO was not able to host coop games)
This happens for every player joining and leaving the game. It's also possible to do this with a filter for the listwidget instead.