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

IndoorMap.pro

@@ -38,7 +38,10 @@ SOURCES += \
 	mapview/3D/MapView3D.cpp \
     params/StairBuilder.cpp \
     mapview/2D/tools/Tools.cpp \
-    params/LayerTree.cpp
+    params/LayerTree.cpp \
+    mapview/2D/tools/ToolMeasure.cpp \
+    params/MetaEditWidget.cpp \
+    params/MetaEditModel.cpp
 
 
 HEADERS  += MainWindow.h \
@@ -130,7 +133,14 @@ HEADERS  += MainWindow.h \
     mapview/model/MMFloorElevator.h \
     params/LayerTree.h \
     params/EditFields.h \
-    mapview/2D/ClickDist.h
+    mapview/2D/ClickDist.h \
+    mapview/2D/tools/ToolMeasure.h \
+    mapview/model/IHasEditableMeta.h \
+    params/MetaEditWidget.h \
+    params/MetaEditModel.h \
+    mapview/model/MapLayerListener.h \
+    mapview/model/MapModelListener.h \
+    mapview/model/MMFloorOutlinePolygonCombined.h
 
 
 FORMS    += MainWindow.ui