Consider switching over to scene graph solution for rendering

[hogsy]

Few possible solutions:

• https://en.wikipedia.org/wiki/OGRE
• https://en.wikipedia.org/wiki/OpenSceneGraph

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• http://scrawl.bplaced.net/blog/?p=442
• https://openmw.org/2015/announcing-switch-openscenegraph/

[hogsy]

I've settled on avoiding this approach, most of the packages I've looked at just seem overly bloated to me - but that's generally because I think we only need a fraction of what they're offering.

While it's going to take longer, I think we'll get better results of implementing our own solutions.