Allow for upper case keyboard shortcuts

Add uppercase; F, S and Q keysyms to cb_input()

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
Reverse the directions of GDK_KEY_Up & GDK_KEY_Down

KEY_Up now moves to the next channel in the list and KEY_Down moves to
the previous channel. I think this is more logically what would be
expected.

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>