call json-utils.js from index.js

[Algorush]

move functions used in 3DStreet-editor and in index.html (and another HTMLs) from json-utils to a global STREET object

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[Algorush]

I will also update the function calls from json-utils.js in the Editor repo

[Algorush]

In this PR, all changes are related to requesting json-utils from index.js and calling json-utils functions from the global STREET.utils object. But I also added all corrections to this PR from here (#440) regarding texture saving. Because incorrect saving and loading of textures led to errors on the screen when saving/loading from the Editor. I forgot to mention this.

[kfarr]

is this function called from 3dstreet editor? it may cause this error
https://github.com/3DStreet/3dstreet-editor/blob/f763a949ce4cd643573ac7f3f7e321d8bbfa8c6a/src/components/scenegraph/Toolbar.js#L130C26-L130C37

[kfarr]

Yes, that is why this PR should be applied to editor after to prevent that error:
3DStreet/3dstreet-editor#387

[kfarr]

changes needed on the editor:

• need to update index.html to match -- removing json utils .js from script include, updating calls to functions to use new global
• may need to update calls to filterJSONstreet function from editor, only pass streetJSON and not removeProps, renameProps