epic2 - load model state from gltf audit json

[kfarr]

• add a few more models (90º rotated street, replace water tower)
• load models into state from .json - actually connect them
• "white list" of models to load

[kfarr]

https://github.com/3DStreet/citybuilderjr/commit/61f58e266a061a14074fc9d14e43231e13c24bc2