Support UTF-8 encoded Unicode for user communications.

(NF_UTF8, togg): New client flag.
(flash, wall): User text input filtering.
(parse, prmptrd): Normal text input filtering.
(uprmptrd, ugetstring): New, to get user text.
(getele, flash, wall): Use them.
(getele): No need to filter out funny characters; input filtering
takes care of them.
(sendmessage, ufindbreak): Work on user text.
(uprnf): New, to print user text.
(rea, gamedown, show_motd): Use it.
(prnf): Unused, remove.
(pr, upr_player): Normal text output filtering (with highlighting).
(pr_flash): User text output filtering.

src/lib/gen/getstring.c

@@ -47,3 +47,16 @@ getstring(char *prompt, char *buf)
 	return 0;
     return buf;
 }
+
+/*
+ * Print sub-prompt PROMPT, receive a line of UTF8 input into BUF[1024].
+ * Return BUF on success, else NULL.
+ */
+char *
+ugetstring(char *prompt, char *buf /* buf is message text */)
+{
+    *buf = '\0';
+    if (uprmptrd(prompt, buf, 1024) < 0)
+	return 0;
+    return buf;
+}