Move key event handling to the core thread from the input service thread). (dm)


git-svn-id: svn://mielke.cc/main/brltty@7191 91a5dbb7-01b9-0310-9b5f-b28072856b6e
Don't crash if the key table isn't set. (dm)


git-svn-id: svn://mielke.cc/main/brltty@7192 91a5dbb7-01b9-0310-9b5f-b28072856b6e
Prevent important keys from being overridden by key bindings. (dm)


git-svn-id: svn://mielke.cc/main/brltty@7193 91a5dbb7-01b9-0310-9b5f-b28072856b6e