[orca-list] Done: Nuke the forced terminal-based setup

[Joanmarie Diggs <jdiggs igalia com>]

Hey all.

I thought of yet another reason why this makes sense: In GNOME 3, when
you enable accessibility support, the desktop becomes accessible without
the need to log out. So.... What I have just committed to master is:

1. The removal of the forced terminal setup.
2. A check to see if accessibility support is enabled. If it's not, 
   enable it.

As a reminder, 'orca -t' is unaffected, unharmed, and happily continues
to exist. <smiles>

I have tested the changes with accessibility support enabled, with it
not enabled, in the graphic desktop, in the console. It all seems to
work as expected.

Thanks y'all for your feedback! Please let me know if you run across any
quirks as a result of this change.

Take care.
--joanie