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.cpp

@@ -0,0 +1,134 @@
+// Copyright (c) Warwick Allison, 1999.
+// Qt4 conversion copyright (c) Ray Chason, 2012-2014.
+// NetHack may be freely redistributed.  See license for details.
+
+// qt4xcmd.cpp -- extended command widget
+
+#include "hack.h"
+#include "func_tab.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 "qt4xcmd.h"
+#include "qt4xcmd.moc"
+#include "qt4bind.h"
+#include "qt4set.h"
+#include "qt4str.h"
+
+namespace nethack_qt4 {
+
+// temporary
+void centerOnMain(QWidget *);
+// end temporary
+
+NetHackQtExtCmdRequestor::NetHackQtExtCmdRequestor(QWidget *parent) :
+    QDialog(parent)
+{
+    QVBoxLayout *l = new QVBoxLayout(this);
+
+    QPushButton* can = new QPushButton("Cancel", this);
+    can->setDefault(true);
+    can->setMinimumSize(can->sizeHint());
+    l->addWidget(can);
+
+    prompt = new QLabel("#", this);
+    l->addWidget(prompt);
+
+    QButtonGroup *group=new QButtonGroup(this);
+    QGroupBox *grid=new QGroupBox("Extended commands",this);
+    l->addWidget(grid);
+
+    int i;
+    int butw=50;
+    QFontMetrics fm = fontMetrics();
+    for (i=0; extcmdlist[i].ef_txt; i++) {
+	butw = std::max(butw,30+fm.width(extcmdlist[i].ef_txt));
+    }
+    int ncols=4;
+
+    QVBoxLayout* bl = new QVBoxLayout(grid);
+    bl->addSpacing(fm.height());
+    QGridLayout* gl = new QGridLayout();
+    bl->addLayout(gl);
+    for (i=0; extcmdlist[i].ef_txt; i++) {
+	QPushButton* pb=new QPushButton(extcmdlist[i].ef_txt, grid);
+	pb->setMinimumSize(butw,pb->sizeHint().height());
+	group->addButton(pb, i+1);
+	gl->addWidget(pb,i/ncols,i%ncols);
+    }
+    group->addButton(can, 0);
+    connect(group,SIGNAL(buttonPressed(int)),this,SLOT(done(int)));
+
+    bl->activate();
+    l->activate();
+    resize(1,1);
+}
+
+void NetHackQtExtCmdRequestor::cancel()
+{
+    reject();
+}
+
+void NetHackQtExtCmdRequestor::keyPressEvent(QKeyEvent *event)
+{
+    QString text = event->text();
+    if (text == "\r" || text == "\n" || text == " " || text == "\033")
+    {
+	reject();
+    }
+    else if (text == "\b")
+    {
+	QString promptstr = prompt->text();
+	if (promptstr != "#")
+	    prompt->setText(promptstr.left(promptstr.size()-1));
+    }
+    else
+    {
+	QString promptstr = prompt->text() + text;
+	QString typedstr = promptstr.mid(1); // skip the '#'
+	unsigned matches = 0;
+	unsigned match = 0;
+	for (unsigned i=0; extcmdlist[i].ef_txt; i++) {
+	    if (QString(extcmdlist[i].ef_txt).startsWith(typedstr)) {
+		++matches;
+		if (matches >= 2)
+		    break;
+		match = i;
+	    }
+	}
+	if (matches == 1)
+	    done(match+1);
+	else if (matches >= 2)
+	    prompt->setText(promptstr);
+    }
+}
+
+int NetHackQtExtCmdRequestor::get()
+{
+    const int none = -10;
+    resize(1,1); // pack
+    centerOnMain(this);
+    // Add any keys presently buffered to the prompt
+    setResult(none);
+    while (NetHackQtBind::qt_kbhit() && result() == none) {
+	int ch = NetHackQtBind::qt_nhgetch();
+	QKeyEvent event(QEvent::KeyPress, 0, Qt::NoModifier, QChar(ch));
+	keyPressEvent(&event);
+    }
+    if (result() == none)
+	exec();
+    return result()-1;
+}
+
+} // namespace nethack_qt4