Cleanup nfEngineTest

Resolves #84

* Scene creation functions moved to Scenes.cpp
* Secondary camera removed
* BVH test removed
* Fixed style (get rid of Hungarian notation)

Verification:
Batch build and run nfEngineTest. Use 0-3 to cycle through scenes.
Some of them will crash, there are created issues for that.

Change-Id: I88b8749f108e07e777129051b62c0d84545fde9e