Accessibility: lookaround command, mention_map option

Adds a new extended command #lookaround, which will describe
the map around the hero they can see or remember.

Adds a new boolean option mention_map, which will give a message
when an interesting map location in sight changes.

src/allmain.c

@@ -769,7 +769,10 @@ newgame(void)
     /* Success! */
     welcome(TRUE);
     notice_mon_on(); /* now we can notice monsters */
-    notice_all_mons(TRUE);
+    if (a11y.glyph_updates)
+        (void) dolookaround();
+    else
+        notice_all_mons(TRUE);
     return;
 }