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/qt4clust.h

@@ -0,0 +1,29 @@
+/*	SCCS Id: @(#)qt_clust.h	3.4	1999/11/19	*/
+/* Copyright (c) Warwick Allison, 1999. */
+/* NetHack may be freely redistributed.  See license for details. */
+
+#ifndef clusterizer_H
+#define clusterizer_H
+
+#include <QtCore/QRect>
+
+class Clusterizer {
+public:
+	Clusterizer(int maxclusters);
+	~Clusterizer();
+
+	void add(int x, int y); // 1x1 rectangle (point)
+	void add(int x, int y, int w, int h);
+	void add(const QRect& rect);
+
+	void clear();
+	int clusters() { return count; }
+	const QRect& operator[](int i);
+
+private:
+	QRect* cluster;
+	int count;
+	const int max;
+};
+
+#endif