[PATCH] terminal split

[Robert Millan]

Hi,

This patch splits terminal handling in input and output.  While at it, it
resolves/removes some of the kludges we had to work around this limitation.

For example, gfxterm/vga no longer need to assume the input is bios console,
at_keyboard can be used in combination with any output terminal, etc.

It will also be possible to turn vga_text.c into a standalone output term,
but this needs more work since it is currently sharing much code with the
bios console in console.c.

-- 
Robert Millan

  The DRM opt-in fallacy: "Your data belongs to us. We will decide when (and
  how) you may access your data; but nobody's threatening your freedom: we
  still allow you to remove your data and not access it at all."

terminal_split.diff
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