Load from url encoded json

[Algorush]

to load from url encoded streetmix json you need:

1. Url encoded streetmix JSON. JSON can be obtained from the Editor, StreetmixAPIURL parameter in the streetmix-loader component of the #default-street element. String can be encoded through encodeURIComponent func in console or here for example: https://www.urlencoder.org/
2. Paste encoded string after http://localhost:7001/#streetmix-json: or http://localhost:7001/#3dstreet-json: for 3dstreet data

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[kfarr]

Thanks please see:

https://github.com/3DStreet/3dstreet/pull/500/files#r1529712137 and https://github.com/3DStreet/3dstreet/issues/502