Move qt-ui to desktop-widgets

Since we have now destkop and mobile versions, 'qt-ui' was a very
poor name choice for a folder that contains only destkop-enabled
widgets.

Also, move the graphicsview-common.h/cpp to subsurface-core because
it doesn't depend on qgraphicsview, it merely implements all the
colors that we use throughout Subsurface, and we will use colors on both
desktop and mobile versions

Same thing applies for metrics.h/cpp

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

desktop-widgets/starwidget.h

@@ -0,0 +1,44 @@
+#ifndef STARWIDGET_H
+#define STARWIDGET_H
+
+#include <QWidget>
+
+enum StarConfig {
+	TOTALSTARS = 5
+};
+
+class StarWidget : public QWidget {
+	Q_OBJECT
+public:
+	explicit StarWidget(QWidget *parent = 0, Qt::WindowFlags f = 0);
+	int currentStars() const;
+
+	/*reimp*/ QSize sizeHint() const;
+
+	static const QImage& starActive();
+	static const QImage& starInactive();
+
+signals:
+	void valueChanged(int stars);
+
+public
+slots:
+	void setCurrentStars(int value);
+	void setReadOnly(bool readOnly);
+
+protected:
+	/*reimp*/ void mouseReleaseEvent(QMouseEvent *);
+	/*reimp*/ void paintEvent(QPaintEvent *);
+	/*reimp*/ void focusInEvent(QFocusEvent *);
+	/*reimp*/ void focusOutEvent(QFocusEvent *);
+	/*reimp*/ void keyPressEvent(QKeyEvent *);
+
+private:
+	int current;
+	bool readOnly;
+
+	static QImage activeStar;
+	static QImage inactiveStar;
+};
+
+#endif // STARWIDGET_H