Converted wmlindent to Python 3

data/tools/wmlindent

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 """\
 wmlindent - re-indent WML in a uniform way.
@@ -61,11 +61,8 @@ if there's an indent open at end of file or if a closer occurs with
 indent already zero; these two conditions strongly suggest unbalanced WML.
 """
 
-from __future__ import print_function, unicode_literals, division
-from future_builtins import filter, map, zip
-
 import sys, os, getopt, filecmp, re, codecs
-from wesnoth import wmltools
+from wesnoth import wmltools3 as wmltools
 
 closer_prefixes = ["{NEXT "]
 opener_prefixes = ["{FOREACH "]