Map: don't derive MapLocation from QObject

Map location is
1) A plain value type
2) Never passed to QML

Make it a simple C++ class.

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

qt-models/maplocationmodel.h

@@ -10,10 +10,8 @@
 #include <QAbstractListModel>
 #include <QGeoCoordinate>
 
-class MapLocation : public QObject
+class MapLocation
 {
-	Q_OBJECT
-
 public:
 	explicit MapLocation();
 	explicit MapLocation(struct dive_site *ds, QGeoCoordinate coord, QString name, bool selected);

subsurface-helper.cpp

@@ -164,6 +164,5 @@ void register_qml_types(QQmlEngine *engine)
 
 	REGISTER_TYPE(MapWidgetHelper, "MapWidgetHelper");
 	REGISTER_TYPE(MapLocationModel, "MapLocationModel");
-	REGISTER_TYPE(MapLocation, "MapLocation");
 #endif // not SUBSURFACE_TEST_DATA
 }