Project Tree updates (#8490)

Split project tree into multiple dockable tree views for plots, keeping one for 3d views.

ApplicationLibCode/Application/RiaDefines.cpp

@@ -314,3 +314,11 @@ bool RiaDefines::isInjector( WellProductionType wellProductionType )
 
     return false;
 }
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+QString RiaDefines::stringListSeparator()
+{
+    return "|";
+}