stats: break out common QtQuick part of the code

Move most of the QtQuick code to its own directory, so that it
can be reused in the future for the chart.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

stats/informationbox.cpp

@@ -1,6 +1,5 @@
 #include "informationbox.h"
 #include "statscolors.h"
-#include "statsview.h"
 #include "zvalues.h"
 
 #include <QFontMetrics>
@@ -9,11 +8,11 @@ static const int informationBorder = 2;
 static const double informationBorderRadius = 4.0; // Radius of rounded corners
 static const int distanceFromPointer = 10; // Distance to place box from mouse pointer or scatter item
 
-InformationBox::InformationBox(StatsView &v) :
+InformationBox::InformationBox(ChartView &v, const StatsTheme &theme) :
 	ChartRectItem(v, ChartZValue::InformationBox,
-		      QPen(v.getCurrentTheme().informationBorderColor, informationBorder),
-		      QBrush(v.getCurrentTheme().informationColor), informationBorderRadius),
-	theme(v.getCurrentTheme()),
+		      QPen(theme.informationBorderColor, informationBorder),
+		      QBrush(theme.informationColor), informationBorderRadius),
+	theme(theme),
 	width(0.0),
 	height(0.0)
 {