use utf8-handling Xft functions if we are in an UTF-8 locale

* (manage.c) in get_wmname(), try to get the (UTF-8 encoded)
  _NET_WM_NAME property.  Fallback to GetWMName() if unavailable.
  Add some debugging bits to see which TEXT encoding clients use
  for WM_NAME.
* (globals.c) use Xft*Utf8 functions to compute text width and
  draw strings.  No regressions with or without Xft, UTF-8 locale
  or not.
* assume we can use Xft*Utf8 functions whenever we have Xft,
  to reduce the #ifdef dance

Original patch from Bernhard R. Link

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