[syslinux] syslinux ansi <-> vesa color mapping

[James Buren]

I have noticed anything using ANSI escape sequences to color text does not work
if syslinux is in VESA mode. It only works if the \1#, \2#, or \3# are used.
This means that libmenu which relies on csprint fails to render colors in
VESA mode. I noticed the default color table has a complete table generated at
runtime for all VGA color combinations, which csprint also does but from VGA
attributes on an as needed basis. I was thinking maybe I could find a way to
bridge it so that csprint can switch from ANSI to the other color API that works
if a compatible match can be found. In the mean time, I have prepared a simple
patch that fixes a small bug in the existing cindex that ANSI uses. The cindex
is currently uint8_t, which limits the colors VESA mode can use to 256 colors
while the VESA uses attr_t, a uin16_t type. I have patched the ansi.h header to
include the vesa header where this type is exposed and then change the cindex
type to attr_t. This should mean the full table can now be accessed. This does
matter because the default color table size is 274 or so.
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