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/statistics/statisticswidget.h

@@ -0,0 +1,23 @@
+#ifndef YEARLYSTATISTICSWIDGET_H
+#define YEARLYSTATISTICSWIDGET_H
+
+#include <QGraphicsView>
+
+class YearlyStatisticsModel;
+class QModelIndex;
+
+class YearlyStatisticsWidget : public QGraphicsView {
+	Q_OBJECT
+public:
+	YearlyStatisticsWidget(QWidget *parent = 0);
+	void setModel(YearlyStatisticsModel *m);
+protected:
+	virtual void resizeEvent(QResizeEvent *event);
+public slots:
+	void modelRowsInserted(const QModelIndex& index, int first, int last);
+	void modelDataChanged(const QModelIndex& topLeft, const QModelIndex& bottomRight);
+private:
+	YearlyStatisticsModel *m_model;
+};
+
+#endif