added a ruler for measuring

added support for meta-data editing
improved element selection
changed zooming
fixed some issues with layer events
fixed issue with 3D outline
fixed loading issue for old maps
some interface changes

mapview/model/IHasEditableMeta.h

@@ -0,0 +1,21 @@
+#ifndef IHASEDITABLEMETA_H
+#define IHASEDITABLEMETA_H
+
+#include <Indoor/floorplan/v2/Floorplan.h>
+
+/**
+ * interface for all classes that provide editable meta information
+ */
+class IHasEditableMeta {
+
+public:
+
+	/** get the meta-information object [if any] */
+	virtual Floorplan::Meta* getMeta() = 0;
+
+	/** set/overwrite the meta-information object */
+	virtual void setMeta(Floorplan::Meta* meta) = 0;
+
+};
+
+#endif // IHASEDITABLEMETA_H