Add Qt4 windowport

Originally by Ray Chason for 3.4.3, based on the Qt windowport by
Warwick Allison. The look and feel is mostly the same.

Some improvements over the Qt 3 interface are:

* Panes are resizable
* Full support for IBMgraphics, and walls and corridors are drawn with
  graphical primitives for a continuous appearance no matter what the font
  says
* Lots of irritating glitches fixed
* Menus support proportional fonts correctly

Adding this because the old Qt windowport cannot be compiled on Qt4,
even with Qt3 compatibility stuff.

TODO:
 - background map glyphs
 - status hilites
 - menucolors

win/Qt4/qt4str.h

@@ -0,0 +1,24 @@
+// Copyright (c) Warwick Allison, 1999.
+// Qt4 conversion copyright (c) Ray Chason, 2012-2014.
+// NetHack may be freely redistributed.  See license for details.
+
+// qt4str.h -- various string functions
+
+#ifndef QT4STR_H
+#define QT4STR_H
+
+namespace nethack_qt4 {
+
+// Bounded string copy
+extern size_t str_copy(char *dest, const char *src, size_t max);
+
+// Case mappings
+extern QString str_titlecase(const QString& str);
+extern QString nh_capitalize_words(const QString& str);
+
+// Map symbol conversion
+extern int cp437(int ch);
+
+} // namespace nethack_qt4
+
+#endif