support for new and old metric plan

[Algorush]

#476

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[kfarr]

@Algorush in index.js I would suggest that we rename the variable streetmixSegmentsFeet to streetmixSegmentsMetric

Everything else looks ok from a code review perspective, testing will be next

[Algorush]

Also might it be better to remove the calcStreetWidth function from streetmix-utils? Because it is simple now. It is used in two places in the code. And instead calculate the width of the street using reduce of segments array in place:

const streetWidth = segments.reduce(
    (streetWidth, segmentData) => streetWidth + segmentData.width, 0);

[kfarr]

Also might it be better to remove the calcStreetWidth function from streetmix-utils? Because it is simple now.

sure!

[kfarr]

This looks good to me. Here was my testing procedure:

I temporarily modified line 92 of index.html https://github.com/3DStreet/3dstreet/blob/main/index.html#L92

old
<a-entity id="default-street" street streetmix-loader set-loader-from-hash></a-entity>

new
<a-entity id="default-street" street streetmix-loader="streetmixAPIURL: http://localhost:7001/examples/streetmix-schema28.json"></a-entity> for testing old schema, and

<a-entity id="default-street" street streetmix-loader="streetmixAPIURL: http://localhost:7001/examples/streetmix-schema30.json"></a-entity> for testing new schema

both seem to work ok with dimensions as expected (per visual inspection)