introduce support for coloring the frame behind a map location

Also includes support by paxed for polearm targeting using the
frame color.

Also renames USE_TILES to TILES_IN_GLYPHMAP which is a more
accurate description.

Not all window interfaces have full support for the color framing
of the background square yet.

MS-DOS needs further work (to bring it to both VESA and VGA, with
and without tiles.

Windows GUI is missing support.

X11 and Qt have been started, but may require further refinement.

include/winX.h

@@ -51,6 +51,8 @@ struct text_map_info_t {
     X11_map_symbol text[ROWNO][COLNO];  /* Actual displayed screen. */
 #ifdef TEXTCOLOR
     X11_color colors[ROWNO][COLNO];     /* Color of each character. */
+    X11_color framecolors[ROWNO][COLNO];  /* Color of background
+                                                 behind text */
     GC color_gcs[CLR_MAX],              /* GC for each color */
         inv_color_gcs[CLR_MAX];         /* GC for each inverse color */
 #define copy_gc color_gcs[NO_COLOR]
@@ -74,6 +76,7 @@ struct tile_glyph_info_t {
     unsigned short glyph;
     unsigned short tileidx;
     unsigned glyphflags;
+    uint32 framecolor;
 };
 
 struct tile_map_info_t {