Add additional viewport options

[BigRoy]

Problem

Like #34 more viewport options are currently lacking support. There are no ways to customize them through the capture gui.

Note: whilst #31 remains unfixed this also means there's no way to playblast with custom settings. Once that's implemented one could disable "override viewport settings" and just directly use the settings from a viewport to workaround missing UI widgets for options

Solution

Implement the options for these features, like:

• Viewport lighting options
• Viewport shading options
• Viewport 2.0 ambient occlusion, motion blur, anti-aliasing settings, etc.

As a note, there are many viewport settings! ;)

[BigRoy]

Because of the large amount of settings I'd like to propose a different solution to this problem that is much more artist-friendly because they recognize the workflow.

What I want to propose is to parent a modelPanel to the widget that the artist can configure (just like any modelPanel). He could set the show visibilities states, the renderer, lighting, shading, etc. The nice bonus is that it's very close to WYSIWYG.

So it would parent something like this:

@aardschok what do you think?

_Note: this would not allow changing the background color in this editable modelPanel, because that's not a setting of the modelPanel itself as such #34 remains a separate issue.

[BigRoy]

Viewport lighting options

These are now implemented with #55