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/qt4key.h

@@ -0,0 +1,40 @@
+// Copyright (c) Warwick Allison, 1999.
+// Qt4 conversion copyright (c) Ray Chason, 2012-2014.
+// NetHack may be freely redistributed.  See license for details.
+
+// qt4key.h -- a key buffer
+
+#ifndef QT4KEY_H
+#define QT4KEY_H
+
+namespace nethack_qt4 {
+
+class NetHackQtKeyBuffer {
+public:
+	NetHackQtKeyBuffer();
+
+	bool Empty() const;
+	bool Full() const;
+
+	void Put(int k, int ascii, int state);
+	void Put(char a);
+	void Put(const char* str);
+	int GetKey();
+	int GetAscii();
+	Qt::KeyboardModifiers GetState();
+
+	int TopKey() const;
+	int TopAscii() const;
+	Qt::KeyboardModifiers TopState() const;
+
+private:
+	enum { maxkey=64 };
+	int key[maxkey];
+	int ascii[maxkey];
+	Qt::KeyboardModifiers state[maxkey];
+	int in,out;
+};
+
+} // namespace nethack_qt4
+
+#endif