New scene function

[Algorush]

Added a newScene function to clear the old scene and create an empty scene. Perhaps there is something else to consider in this function, @kfarr ?
In the next commits I will add call of this function to the appropriate places in the code.
#485

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[Algorush]

what should be the initial structure of Blank Scene? Like this one?

<a-entity id="street-container" data-layer-name="3D Street Layers" data-layer-show-children>
   <a-entity id="default-street" set-loader-from-hash></a-entity>
</a-entity>
<a-entity id="reference-layers" data-layer-name="Reference Layers" data-layer-show-children></a-entity>
<a-entity id="environment" data-layer-name="Environment" street-environment="preset: day;"></a-entity>

[Algorush]

I have added newScene funtion as STREET.utils.newScene. I have also added a call to this function in the appropriate scene loading methods, including in the Editor code: 3DStreet/3dstreet-editor#420

[kfarr]

things this does not reset yet:

• * currently selected object blue bounding box
• * long / lat / elevation in geopanel above scene title
• only show for pro users
• * camera pose (position and rotation) -- this is probably ok to leave for a later date

[vincentfretin]

While reviewing, I ended up refactoring the buttons to properly use the Button component.

[kfarr]

similar to scene title edit modal, when the street-geo component is updated, we should also fire an event such that the react app is listening for this event and 'resets' the geo panel?

[vincentfretin]

similar to scene title edit modal, when the street-geo component is updated, we should also fire an event such that the react app is listening for this event and 'resets' the geo panel?

@kfarr and I started a GeoContext on @kfarr machine. Almost finished, we just need to reset the context value after calling newScene. We will finish that Friday.

[vincentfretin]

Also probably put the "New" button behind a flag or just comment it before merging.
Like discussed, just having a new blank scene, without some templates or onboarding is confusing for the user.

[kfarr]

@vincentfretin i committed our WIP work and tested, all seems to work with exception of resetting geo stuff as you noted so we can resume that on Fri