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/qt4xcmd.h

@@ -0,0 +1,31 @@
+// Copyright (c) Warwick Allison, 1999.
+// Qt4 conversion copyright (c) Ray Chason, 2012-2014.
+// NetHack may be freely redistributed.  See license for details.
+
+// qt4xcmd.h -- extended command widget
+
+#ifndef QT4XCMD_H
+#define QT4XCMD_H
+
+namespace nethack_qt4 {
+
+class NetHackQtExtCmdRequestor : public QDialog {
+    Q_OBJECT
+
+protected:
+    virtual void keyPressEvent(QKeyEvent *event);
+
+public:
+    NetHackQtExtCmdRequestor(QWidget *parent);
+    int get();
+
+private:
+    QLabel *prompt;
+
+private slots:
+    void cancel();
+};
+
+} // namespace nethack_qt4
+
+#endif