Print: add UI for a print dialog

PrintOptions is a QWidget class to be used as an
addition to a future print dialog (possibly based on
QPrintDialog). Currently only contains a couple of
radio buttons.

PrintDialog (printdialog.cpp/h) which is a basic QDialog
is currently added for testing only and it holds
an instance of PrintOptions.

Calling File->Print opens this test dialog for now.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>

qt-ui/printoptions.h

@@ -0,0 +1,23 @@
+#ifndef PRINTOPTIONS_H
+#define PRINTOPTIONS_H
+
+#include <QWidget>
+#include "../display.h"
+
+namespace Ui {
+	class PrintOptions;
+};
+
+// should be based on a custom QPrintDialog class
+class PrintOptions : public QWidget {
+Q_OBJECT
+
+public:
+	static PrintOptions *instance();
+
+private:
+	explicit PrintOptions(QWidget *parent = 0, Qt::WindowFlags f = 0);
+	Ui::PrintOptions *ui;
+};
+
+#endif