new C++ demo: realtime.cc (real-time scene viewer using SDL) Quaternion, Camera::rotate and Camera::move replace all printf's with infomsg wrapper don't allocate memory in Raytracer::render, just blindly write to provided address don't creat Container object in Raytracer, let user do it

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demos/*.png

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demos/kdtree.obj

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demos/*.ply

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ccdemos/*.png

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ccdemos/spheres_shadow

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ccdemos/realtime