Adding aria roles and setting focus to allow for screen reader access.  ...

...This does not solve all issues, but allows for the screen reader to interact with the modal.

This PR allows a screen reader to interact and select files, but it is still not pretty.  The screen reader does not get any  indication of the wait cursor.  The links for expanding a table row get read as 3 separate items.  My wording on the SR title sucks. And I am sure there are other items too..