Outlook 2016: report category and flagged status for messages. (#8608)
* Outlook 2016: report category and flagged status for messages.
* Outlook: work around bug in UIA's getCachedChildren on Outlook conversation view threads where it fails to return any children at all. We can instead filter the tree for text and image elements which seems to get around the issue.
* Outlook: check the object model to see if we should report the UIA flag and category fields.
* Outlook: remove now unused oleFlagLabels dictionary
* Outlook appModule: check that we actually have an object model selection when matching on different fields for message rows.
* Update what's new