[whatwg/dom] Be more precise about removal and insertion (#435)

In particular, define them as operations on an object’s children, which
is now defined to be an ordered set.

Fixes #174. (Note that we don’t have to define how the various pointers
mentioned there are updated, since those are all ultimately based on
how parent/child are defined.)
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/435

-- Commit Summary --

  * Be more precise about removal and insertion

-- File Changes --

    M dom.bs (30)

-- Patch Links --

https://github.com/whatwg/dom/pull/435.patch
https://github.com/whatwg/dom/pull/435.diff

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