In 16 color mode, text colors are mapped onto the colors available in
the tileset. The mapping is a compromise, and is not one-to-one: cyan
and bright cyan are the same, and magenta and bright magenta are the
same.
This change defines a separate palette for use by the text map, and
switches palettes on any transition between text and tiled maps.
Ray Chason
f3f39311e5