[epic] v3 of save / share scenes

[kfarr]

As a user I can open community scenes or import a streetmix street, modify the scene, name it, then save and share the scenes URL directly with other people.

(This is a followup to v2 open/save scenes epic 3DStreet/3dstreet-editor#259)

PR for this epic: TBD

Business Goals

• [x] Test email sending - automatic after joining
• [x] Zade - Open community scenes route (featured scenes) when opening empty app https://github.com/3DStreet/3dstreet-editor/issues/299

User Expectations

• [x] Zade - boolean property widget does not work as expected https://github.com/3DStreet/3dstreet-editor/issues/374
• [x] Zade https://github.com/3DStreet/3dstreet-editor/issues/371
• [x] always show duplicate / delete / component info https://github.com/3DStreet/3dstreet-editor/issues/362
• [x] Zade - after thumbnail set does not show in open modal 3DStreet/3dstreet-editor#375
• [x] 3DStreet/3dstreet-editor#377
• [x] AG? thumbnail not created in some cases 3DStreet/3dstreet-editor#351
• [x] AG? sometimes screenshot results in black image https://github.com/3DStreet/3dstreet-editor/issues/372
• [x] AG - use STREET global in Editor repo https://github.com/3DStreet/3dstreet/issues/390

Instrumentation:

• [x] Zade - fix google analytics loading https://github.com/3DStreet/3dstreet-editor/issues/390
• [x] Zade - Instrument top 2 metrics https://github.com/3DStreet/3dstreet-editor/issues/324

To defer for future

• Zade - break up build file into smaller pieces https://github.com/3DStreet/3dstreet/issues/591
• create prod vs. dev server firebase target settings https://github.com/3DStreet/3dstreet-editor/issues/355
• generate GLB upon user request https://github.com/3DStreet/3dstreet/issues/592
• Teleport behavior should match editor + core https://github.com/3DStreet/3dstreet-editor/issues/313
• title not displaying when loading scene in new window from URL 3DStreet/3dstreet#577

[kfarr]

completed another epic, thanks @ViktoriaShurhot !