Add polygon file readers and make sure UI items are in sync

* Add polygon reader for POL file format
* Add CSV import
* Add helper function to create tag with color and text
* Show polygon color as tag, allow color edit by clicking on tag
* Support optional header in csv file
* Add Reload on polygon file
* Show warning icon if no polygons
* Improve logging text
* Do not show file polygon in view if no polygons are imported
* Use appendMenuItems
* Set default polygon color to orange
* Enter edit state when creating a new polygon
* Fix missing UI text in menu builder

ApplicationLibCode/ProjectDataModel/Polygons/RimPolygonAppearance.h

@@ -37,6 +37,9 @@ public:
     void setIsClosed( bool isClosed );
     bool isClosed() const;
 
+    cvf::Color3f lineColor() const;
+    void         setLineColor( const cvf::Color3f& color );
+
 public:
     RimPolygonAppearance();