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Add DOMCompat classes to support the DOM methods missing from PHP DOM

Adds some missing methods from DOM level 3 and from HTMLElement in the
HTML spec. Only includes methods actually used by Parsoid, to keep
complexity down.

Ideally we'd just extend the PHP DOM classes, but DOM objects create
other DOM objects and we have no way of turning those into our extended
types, so we just provide static helpers with identical names instead.
E. g.

    $fooElmt = $elmt->querySelector( '.foo' );
    $innerHtml = $fooElmt->innerHtml;

becomes

    $fooElmt = DOMCompat::querySelector( $elmt, '.foo' );
    $innerHtml = DOMCompat::getInnerHtml( $fooElmt );

Bug: T215000
Change-Id: I7deccaca1

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