wire gen: add subtypes to printwires

now we print the subtypes out when you call printwire

note that we have to reverse the order the subtypes appear in
because
  1) they're static and,
  2) a few of them are nested

tools/generate-wire.py

@@ -1480,12 +1480,16 @@ includes = '\n'.join(includes)
 printcases = ['case {enum.name}: printf("{enum.name}:\\n"); printwire_{name}("{name}", msg); return;'.format(enum=m.enum, name=m.name) for m in toplevel_messages]
 
 if options.printwire:
-    decls = [m.print_printwire(options.header) for m in toplevel_messages + messages_with_option]
+    decls = []
     if not options.header:
+        subtype_decls = [m.print_printwire(options.header, is_embedded=True) for m in subtypes]
+        subtype_decls.reverse()
+        decls += subtype_decls
         if len(tlv_fields):
             decls += print_tlv_printwires(options.enumname, tlv_fields)
         else:
             decls += [print_tlv_message_printwire_empty.format(enumname=options.enumname)]
+    decls += [m.print_printwire(options.header) for m in toplevel_messages + messages_with_option]
 else:
     towire_decls = []
     fromwire_decls = []