[w3c/webcomponents] Upstreaming Shadow DOM and outstanding v1 work (#661)

Previously: #377, #495.

- [x] 2. Shadow Tree (=> DOM Standard)
- [x] 3. Mutation algorithms (=> DOM Standard)
- [ ] 4. Events (=> DOM Standard, UI Events, Touch Events; information about UI and Touch already removed from "Shadow DOM")
  - [x] DOM Standard
  - [ ] UI Events: https://github.com/w3c/uievents/issues/157
  - [ ] Touch Events: https://github.com/w3c/touch-events/issues/84
- [ ] 5. User interaction
- [x] 6. HTML Elements in Shadow Trees (information in "Shadow DOM" is obsolete)
- [ ] 7. Elements and DOM interfaces (=> DOM Standard and  HTML Standard)
  - [ ] DocumentOrShadowRoot
  - [ ] Shadow.prototype.innerHTML: https://github.com/w3c/DOM-Parsing/issues/21

Outstanding issues in DOM and HTML:

- [ ] https://github.com/whatwg/dom/labels/shadow
- [ ] https://github.com/whatwg/html/labels/topic%3A%20shadow

Outstanding issues in this repository:

- [ ] https://github.com/w3c/webcomponents/issues?q=is%3Aopen%20label%3Av1%20label%3Ashadow-dom

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