Report row and column span for table cells in speech and braille (#7872)
* Support pronouncing row and column span with speech
* Announce row and column span on the web
* Fix announcements when row or column span differs even though the row or column number stays the same
* Show row/column span in braille
* IAccessible NVDAObject: support rowspan and columnSpan.
* compoundDocuments: support rowSpan and columnSpan.
* Converted rowStr and columnStr to strings with string formatting/named arguments to fulfill a desire of checkpot which will otherwise throw warnings
* Update copyright header
* Update copyright year