Plot Template updates (#9002)

* Ensemble plot templates now have .erpt extension and new icon
* Default plot templates are given a checkmark overlay on the icon
* Context menu has been cleaned up a bit
* Old default template is really just the last used template. Rename it.
* Add max. recursive depth setting in preferences for plot template searches
* Only create plots based on correct template type when importing ensembles or single cases
* Support creating new plot from template explorer
* Update last used template when creating a new plot from a template

ApplicationLibCode/Commands/PlotTemplateCommands/RicSetAsDefaultTemplateFeature.cpp

@@ -53,6 +53,8 @@ void RicSetAsDefaultTemplateFeature::onActionTriggered( bool isChecked )
         RiaPreferencesSummary::current()->addToDefaultPlotTemplates( file->absoluteFilePath() );
     else
         RiaPreferencesSummary::current()->removeFromDefaultPlotTemplates( file->absoluteFilePath() );
+
+    file->updateIconState();
 }
 
 //--------------------------------------------------------------------------------------------------
@@ -67,8 +69,7 @@ void RicSetAsDefaultTemplateFeature::setupActionLook( QAction* actionToSetup )
     if ( file != nullptr )
     {
         actionToSetup->setCheckable( true );
-        actionToSetup->setChecked(
-            RiaPreferencesSummary::current()->isDefaultSummaryPlotTemplate( file->absoluteFilePath() ) );
+        actionToSetup->setChecked( file->isDefaultTemplate() );
     }
 }