Made object type more prominent in the SceneInspector.

As requested in #897. This also paves the way for summaries in other SceneInspector headers as per #911.
Improved object section in SceneInspector

- Added section for displaying camera parameters.
- Added section for displaying primitive variables with types, interpolation and geometric interpretation.
- Added field for mesh interpolation.

Fixes #897.
Merge pull request #1062 from johnhaddon/sceneInspectorObject

SceneInspector object section improvements