Fixed #614 Change resolution for input Video

Fixes #614
- Add more options for Video Passthrough Setting, which will change the output video resolution.

![default](https://cloud.githubusercontent.com/assets/5828044/4518433/e098dd04-4c8b-11e4-9422-781c8695115e.png)


For the history. We used to use the resmap for video scaling back in the Freeseer 2.x days but after the big rewrite we never got around to pulling this feature forward into 3.x.  Back in the day we used to do resolution by declaring things like 1080p and mapping it to a resolution. This makes it easier for end users to use as they are likely more used to that wording than with exact resolution numbers.