Initial Python 3 compatible code

src/widgetUtils/__init__.py

@@ -1,4 +1,5 @@
 from __future__ import absolute_import
+from __future__ import unicode_literals
 import platform
 if platform.system() == "Windows":
  from .wxUtils import *

src/widgetUtils/gtkUtils.py

@@ -1,3 +1,6 @@
+from __future__ import unicode_literals
+from builtins import range
+from builtins import object
 from gi.repository import Gtk, Gdk
 from gi.repository import GObject
 

src/widgetUtils/wxUtils.py

@@ -1,3 +1,4 @@
+from __future__ import unicode_literals
 import wx
 import wx.adv
 import paths