Refactor LayoutOptions to improve readability

* Make it possible to use designated initializer list
- remove default constructor
- move static member to outer scope

* Add helper function to add field on same row

ApplicationLibCode/ProjectDataModel/Annotations/RimReachCircleAnnotation.cpp

@@ -128,7 +128,7 @@ void RimReachCircleAnnotation::defineUiOrdering( QString uiConfigName, caf::PdmU
 {
     uiOrdering.add( &m_name );
     uiOrdering.add( &m_centerPointXyd );
-    uiOrdering.add( &m_centerPointPickEnabled, false );
+    uiOrdering.appendToRow( &m_centerPointPickEnabled );
     uiOrdering.add( &m_radius );
 
     auto appearanceGroup = uiOrdering.addNewGroup( "Appearance" );