N°2847 - Rework iTopWebPage layout (WIP Part IV)

- iTopWebPage: Clean up some commented sections
- iTopWebPage: Marked some new methods as @internal
- iTopWebPage: Restore page content to allow // developments
- Quick create: Add quick object creation box to the top bar
- Global search: Improve cinematic with other widgets
- Components / Layouts: Move JS parts to iTopWebPage, will be put in dedicated PHP helpers later

css/backoffice/components/_all.scss

@@ -17,4 +17,5 @@
  */
 
 @import "breadcrumbs";
+@import "quick-create";
 @import "global-search";