Function key pass-through for tty

[idun-project]

The tty currently translates function keys to macros by default. Since these macros probably don't do anything useful in Linux, it would be better if the default behavior was to pass the function key code over the tty. There should also be a command-key to optionally enable macro output instead.

This will allow programs such as htop to work better in the tty, since the function keys will work as expected.