[orca-list] Status bar presentation updated and includes braille support

[Joanmarie Diggs <jdiggs igalia com>]

Hey all.

I made a number of changes today in Orca master regarding presentation 
of the status bar. It was prompted by some VSCode support wanted in 
Orca, but led to some bigger changes. Most notably:

* If you are a braille user, when you give the command to speak the
  status bar, braille will also be generated so you can examine the
  bar that way without having to flat review the last line.

* Roles are now presented (e.g. so you know if something is a button
  or link in the status bar).

* Labels in braille now have the end-of-line marker, if you have this
  setting enabled. Feedback on this would be helpful. The rationale
  was the label soup I saw in braille for LibreOffice Writer. Speech
  separates these things out with pauses so you don't hear label
  soup.

I also found an inconsistency in what was spoken for a link (name is 
preferred) versus braille (actual text, complete with non-printable 
characters, was preferred). Now braille also prefers name. Let me know 
if that change has any unanticipated side effects.

Thanks!
--joanie