fix for Qt6

MapView add contrast property
MapView fix plugin

libs/map/mapview.h

@@ -36,6 +36,7 @@ class QAD_MAP_EXPORT MapView: public QWidget {
 	Q_OBJECT
 	Q_PROPERTY(QPointF center READ center WRITE setCenter)
 	Q_PROPERTY(double zoom READ getZoom WRITE setZoom)
+	Q_PROPERTY(double contrast READ getContrast WRITE setContrast)
 	Q_PROPERTY(bool offlineMode READ isOfflineMode WRITE setOfflineMode)
 
 	friend class MapViewTileDownloader;
@@ -58,6 +59,12 @@ public:
 	double getZoom() const { return zoom_; }
 	void setZoom(double z);
 
+	double getContrast() const { return contrast; }
+
+	/// 0 - 100
+	void setContrast(double value);
+
+	/// {lat, lng}
 	QPointF clickedCoordinate() const { return last_click_coord; }
 
 	QString cachePath() const;
@@ -107,7 +114,7 @@ private:
 	QVector<MapItemBase *> items_;
 	QBrush brush_tr;
 	bool is_pan = false, is_downloading = false, is_offline = false;
-	double zoom_ = 1., scale_ = 1., px2m = 1.;
+	double zoom_ = 1., scale_ = 1., px2m = 1., contrast = 100.;
 	int zoom_level = 0, tiles_side = 1, max_level = 19;
 
 public slots: