Refactored addition of well path models

Well path models can now be added to geo mech models. Moved code that
adds well path models to a scene from RimEclipseView to
RimView::addWellPathsToScene(). This new function is now used by both
RimEclipseView and RimGeoMechView. Made sure that it is not needed to
load a result before well paths appear. TODO: Compute characteristic hex
element size for geo mech models.

ApplicationCode/ProjectDataModel/RimView.h

@@ -32,6 +32,8 @@ class RimCellRangeFilterCollection;
 
 namespace cvf
 {
+    class BoundingBox;
+    class Scene;
     class Transform;
 }
 
@@ -108,6 +110,7 @@ public:
 protected:
 
     void                                    setDefaultView();
+	void									addWellPathsToScene(cvf::Scene* scene, const cvf::Vec3d& displayModelOffset, double characteristicCellSize, const cvf::BoundingBox& boundingBox, cvf::Transform* scaleTransform);
 
     virtual void                            createDisplayModel() = 0;
     virtual void                            updateDisplayModelVisibility() = 0;