[whatwg/dom] Shadow: define slotchange event (#229)

Fixes https://github.com/w3c/webcomponents/issues/288.

This defines the slotchange event in response to remove/insert
operations, changes to a slot’s name attribute, and changes to an
element’s slot attribute.

This also introduces the assigned nodes concept for slots, and assigned
slot concept for slotables.

Slotables now also have a name, rather than a “get name”.

The slotchange event dispatches just after mutation observers.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/229

-- Commit Summary --

  * Shadow: define slotchange event

-- File Changes --

    M dom.bs (191)
    M dom.html (163)

-- Patch Links --

https://github.com/whatwg/dom/pull/229.patch
https://github.com/whatwg/dom/pull/229.diff

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