updated window_procs

Add a non-string identifier to window_procs for use in runtime
identification of the current window port being used.

Use a macro WPID to add the identification at the top of the
various existing window_procs declarations. It expands to the
existing text string, as well as the newly added field wp_id
with a wp_ identifier.

For example, WPID(tty) expands to: "tty", wp_tty

The generated wp_tty must be present in the wp_ids enum at
the top of include/winprocs.h.

The WINDOWPORT(x) macro has been updated to expand to a simple
value comparison (port.wp_id == wp_x), instead of a
string comparison.

src/options.c

@@ -6304,7 +6304,7 @@ initoptions_finish(void)
      * Option processing can take place before a user-decided WindowPort
      * is even initialized, so check for that too.
      */
-    if (!WINDOWPORT(safe-startup)) {
+    if (!WINDOWPORT(safestartup)) {
         if (iflags.hilite_delta && !wc2_supported("statushilites")) {
             raw_printf("Status highlighting not supported for %s interface.",
                        windowprocs.name);