Bochs VBE Extensions Graphics Driver

People,

We are no longer limited to 300x240x256!

Please find attached a working bochs VBE extension graphics driver.
This driver has been tested in both bochs and qemu (requires -std-vga
option in qemu).  It will not work on real hardware.

Remember, you will need to add the line "(require :x86-pc/bochs-vbe)" to
all.lisp in x86-pc directory to include it in your image.

The next step is to abstract the framebuffer drawing commands from
vga.lisp and place them into a separate file for use with any graphics
driver.

Happy hacking,
Martin