Uia in ms word by default (#8919)
* UIAHandler: Use UIA in MS Word documents by default for MS Office for version 16.0.9000 and above.
* Stop refusing to use UIA for MS Office Ribbons, rather fix specific problems directly: Office 2010 options dialog comboboxes have no name, and Outlook pre 2016 autoComplete list should use MSAA.
* UIA WordDocumentTextInfo: remove custom implementation of isCollapsed property. It is no longer needed in recent versions of MS Word, and in fact it was causing tables to not be reported when positioned on a blank cell.
* UIATextInfo.UIAElementAtStart: catch a COMError when fetching children. Seen at the bottom of MS Word documents.
* Address review actions.
* Fix typo in _UIAHandler: MS Office build number should be 9000 not 90000.
* Work around bug in MS Word where a table cell could appear outside of a table in the UIA tree, causing a 10 second freeze and infinite recursion error.
* Update what's new.
