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/qt4line.cpp

@@ -0,0 +1,42 @@
+// Copyright (c) Warwick Allison, 1999.
+// Qt4 conversion copyright (c) Ray Chason, 2012-2014.
+// NetHack may be freely redistributed.  See license for details.
+
+// qt4line.cpp -- a one line input window
+
+#include "hack.h"
+#undef Invisible
+#undef Warning
+#undef index
+#undef msleep
+#undef rindex
+#undef wizard
+#undef yn
+#undef min
+#undef max
+
+#include <QtGui/QtGui>
+#if QT_VERSION >= 0x050000
+#include <QtWidgets/QtWidgets>
+#endif
+#include "qt4line.h"
+
+namespace nethack_qt4 {
+
+NetHackQtLineEdit::NetHackQtLineEdit() :
+    QLineEdit(0)
+{
+}
+
+NetHackQtLineEdit::NetHackQtLineEdit(QWidget* parent, const char* name) :
+    QLineEdit(parent)
+{
+}
+
+void NetHackQtLineEdit::fakeEvent(int key, int ascii, Qt::KeyboardModifiers state)
+{
+    QKeyEvent fake(QEvent::KeyPress,key,state,QChar(ascii));
+    keyPressEvent(&fake);
+}
+
+} // namespace nethack_qt4