Start a user survey dialog

The idea is that a week after the user starts using Subsurface we ask them
if they would like to submit a survey response.

If you are running a development build, don't wait seven days.

This patch doesn't do anything with the user's selections, doesn't submit
anything to our server, etc. It's just a placeholder to tune what we
should ask, etc.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/usersurvey.h

@@ -0,0 +1,25 @@
+#ifndef USERSURVEY_H
+#define USERSURVEY_H
+
+#include <QDialog>
+
+namespace Ui {
+	class UserSurvey;
+}
+
+class UserSurvey : public QDialog {
+	Q_OBJECT
+
+public:
+	explicit UserSurvey(QWidget *parent = 0);
+	~UserSurvey();
+
+private
+slots:
+	void on_buttonBox_accepted();
+	void on_buttonBox_rejected();
+
+private:
+	Ui::UserSurvey *ui;
+};
+#endif // USERSURVEY_H