improve project dialog system

- project model : refactor getSteps() method
- create dialog store
- create DialogWrapper component that open the dialog corresponding to the URL query param

public/site/blueprints/pages/virtual-sample.yml

@@ -17,5 +17,8 @@ options:
 tabs:
   contentTab:
     fields:
+      views:
+        label: Vues
+        type: files
       stepName:
         type: hidden