[orca-list] New terminal script. Please test.

[Joanmarie Diggs <jdiggs igalia com>]

Hey all.

I've just committed a new script for accessible terminal objects. It
should work with terminals Orca can see, and not require special mapping
for applications. Notes:

1. You should do a clean build, autogen, etc.

2. KDE's Konsole, at least for me in Fedora 24, is not an accessible
   terminal. The rest of the app shows up in Accerciser; the terminal
   object does not. If Orca cannot see it, Orca cannot present it.

3. I've fixed a couple of Orca bugs, and worked around a couple of
   VTE issues, in the process.

Thanks for testing!
--joanie