Accessibility: give message for created monsters

Always give a message when creating a detected monster
during gameplay (as opposed to during level creation).
To prevent the message, use the MM_NOMSG flag for makemon.

Most places already handled their own messaging, but there
were some, such as bag of tricks, create monster magic
and random monsters created during gameplay that didn't.

src/zap.c

@@ -618,7 +618,7 @@ montraits(struct obj *obj, coord *cc,
                            give mtmp any; it will be given a new 'wormno'
                            though (unless those are exhausted) so be able
                            to grow new tail segments */
-                        | MM_NOTAIL
+                        | MM_NOTAIL | MM_NOMSG
                         | (adjacentok ? MM_ADJACENTOK : 0)));
         if (!mtmp) {
             /* mtmp2 is a copy of obj's object->oextra->omonst extension
@@ -775,7 +775,7 @@ revive(struct obj *corpse, boolean by_hero)
     coord xy;
     xchar x, y;
     boolean one_of;
-    long mmflags = NO_MINVENT | MM_NOWAIT;
+    long mmflags = NO_MINVENT | MM_NOWAIT | MM_NOMSG;
     int montype, cgend, container_nesting = 0;
     boolean is_zomb = (mons[corpse->corpsenm].mlet == S_ZOMBIE);
 
@@ -1482,7 +1482,7 @@ create_polymon(struct obj *obj, int okind)
     if (!(g.mvitals[pm_index].mvflags & G_GENOD))
         mdat = &mons[pm_index];
 
-    mtmp = makemon(mdat, obj->ox, obj->oy, NO_MM_FLAGS);
+    mtmp = makemon(mdat, obj->ox, obj->oy, MM_NOMSG);
     polyuse(obj, okind, (int) mons[pm_index].cwt);
 
     if (mtmp && cansee(mtmp->mx, mtmp->my)) {
@@ -1867,7 +1867,7 @@ stone_to_flesh_obj(struct obj *obj)
             } else { /* (obj->otyp == FIGURINE) */
                 if (golem_xform)
                     ptr = &mons[PM_FLESH_GOLEM];
-                mon = makemon(ptr, oox, ooy, NO_MINVENT);
+                mon = makemon(ptr, oox, ooy, NO_MINVENT|MM_NOMSG);
                 if (mon) {
                     if (costly_spot(oox, ooy)
                         && (carried(obj) ? obj->unpaid : !obj->no_charge)) {