Ray Chason 686153f6cb Sundry fixes for DOS 16-color VGA mode ...

To test 16-color mode, specify OPTIONS=video:vga explicitly;
autodetect will choose a VESA mode if it can.

* Draw tiles correctly when redrawing from panning or from changing
  the map mode among text, tiles and overview. Previously, this would
  draw everything with the tile at the hero's position.

* Draw corridor walls with the stone tile.

* Map the statue colors to the nearest neutral tone among the main
  16 colors. This mainly affects altars and female cats.

* Fix the code that shows statues as the generic statue tile. This
  code could be deleted, but the statues don't draw with the full
  range of gray tones.

* Document the option OPTIONS=video:vesa.

2022-09-13 19:49:56 -04:00

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