This change attempts full code coverage. However the Fn key
functionality cannot be reached by my emulator version. All the tests
with Function key fail.
This reverts commit fd719e10d6, reversing
changes made to 113d77e5fa.
This change was reverted because it caused a regression in the way soft
keyboard modifier keys worked. (e.g. using the volume keys as control
keys.) I think the regression happened because the change introduced
multiple copies of TermKeyListener. There should be only one instance
of TermKeyListener for each terminal window.
I would still like the feature (of having Alt send Esc), but without the
regression to the soft keyboard.
