reduce building complexity and split into parts about 3dstreet HOT 6 CLOSED

Need to fix building scale issues:
https://blender.stackexchange.com/questions/57040/normalize-all-objects-scale-and-rotation-transforms

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That method worked to fix building scale. Appears to be 1 draw call per part (per building)? Test to be sure. The to implement cloning of buildings along road.

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Done with a40af12 however needs documentation and before/after stats comparison. Also writeup tickets for next steps (more building types, instancing?)

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Stats to compare before and after for performance
test city? http://localhost:8080/#https://streetmix.net/kfarr/44

// OLD combined model
Geometries - 999, Programs - 13, Textures - 299
Calls - 1575, Triangles - 444960
60fps
// UPDATED with 'psuedorandom' buildings from gltf-part
geometries 813, programs 13, textures 296
calls 885, triangles 452582
60fps

It cut draw calls in half and about same number of triangles, so keep this change!

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I tried with gltfpack and the -kn option but resultant gtlf part didn't display but it does display in gltf viewer, more debugging needed zeux/meshoptimizer#151

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Sticking with draco for now, this is done

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