Minor UI changes to make stuff more retarded.

- Advanced settings moved to Encoding tab.
- Some groupBoxes have been merged.
- 2-pass mode is now implied by enabling "HQ mode".

- 2-pass encoding now properly uses avsFileName rather than input.
Added an easy view for processing + UI updates.

The buttons are still stubs. They don't do anything smart yet.
I need to make a reusable preview control for use in CropForm mk2 et.c.

Also, the UI has been given an autism pass. Means nothing to users.
But tabindex is fixed again! And the arguments update more often.

The filters need icons in the easy view.

Support for multiple trims would be good.

The subtitle tab is ignored for now, because it will likely get moved
  to processing. AviSynth can handle subtitles for us.