1st of a few sequencing changes

rename display_gamewindows() to init_sound_and_display_gamewindows()
(I know that's getting pretty long-named).

move activate_chosen_soundlib() into init_sound_and_display_gamewindows()
from moveloop_preamble().

Also included was a missing break in a switch related to sounds.

outdated/sys/mac/macmain.c

@@ -65,7 +65,7 @@ main(void)
      */
     vision_init();
 
-    display_gamewindows();
+    init_sound_and_display_gamewindows();
 
     set_playmode(); /* sets plname to "wizard" for wizard mode */
     /* strip role,race,&c suffix; calls askname() if plname[] is empty