[WICG/webcomponents] Add new declarative syntax and update iterative proposal (PR #1023)

This PR makes various changes against the current DOM parts proposal:

1. Adds a prospective declarative proposal. The basic syntax is `{{}}` for a self-contained part, `{{#}}{{/}}` for part with content. Parsing is enabled with a `parseparts` attribute on any DOM node.
2. `DocumentPartRoot` or `ChildNodePart` are now containers for other nested parts. Browsers will need to maintain the nested list of parts.
3. Cloning operation exists on `DocumentPartRoot` and `ChildNodePart` and returns a new `Part`.
You can view, comment on, or merge this pull request online at:

  https://github.com/WICG/webcomponents/pull/1023

-- Commit Summary --

  * Update DOM-Parts-Imperative.md after DOM parts discussion
  * Add more syntax for declarative DOM

-- File Changes --

    D proposals/DOM-Parts-Declarative-Template.md (73)
    A proposals/DOM-Parts-Declarative.md (128)
    M proposals/DOM-Parts-Imperative.md (396)
    M proposals/DOM-Parts.md (2)

-- Patch Links --

https://github.com/WICG/webcomponents/pull/1023.patch
https://github.com/WICG/webcomponents/pull/1023.diff

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