* add virtual consoles by using wsdisplay_vcons
* make use of generic scrollback support for consoles
* enable colour support for vidcvideo consoles
* use the default NetBSD font, rather than picking a sony one
* make kernel output green, so it's obvious.
This was tested at 800x600 in 8bpp on an A7000+ and 2MB VRAM RiscPC.
To actually benefit from these changes wscons=YES needs to be added to
your rc.conf
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