granular verbose message suppression mechanics

Switch to using a macro invocation Verbos(n, s) in place of the
flags.verbose checks.

Provide the mechanics for individual suppression of any of the
existing messages that were considered verbose.

Mechanics only - this code update does not provide any means of
setting the suppression bits.

iflags.verbose = 0
is still a master suppression of all the verbose messages.

iflags.verbose = 1
turns on the verbose messages only for those whose suppression
bit is 0 (not set).

src/pager.c

@@ -1570,7 +1570,7 @@ do_look(int mode, coord *click_cc)
 
         if (from_screen || clicklook) {
             if (from_screen) {
-                if (flags.verbose)
+                if (Verbose(2, dolook))
                     pline("Please move the cursor to %s.",
                           what_is_an_unknown_object);
                 else