* Kept old js widget but refactored/tweak'd it with some of our new conventions
* Added a newsroom menu component extending popupmenu
* Working as in 2.7
Still todo :
* Add variables for scss file
* Use wiget variables for most of js widget
* Correctly place the popup (absolute with <> containers ? poppers.js ? )
* Intialize toggler red bubble when new messages are in
* Replace hardcoded text in usermenu with correct dict entry updated with the nb of new message
* Only allow to open the popup when ajax calls are done
- iTopWebPage: Restore "open search" feature
- iTopWebPage: Change all resources URL to absolute in order to benefit from the "duplicate removal" benefits
- iTopWebPage: Remove obsolete method IsMenuPaneVisible()
- Config: Add new parameters quick_create.enabled / global_search.enabled / breadcrumb.enabled
- utils: Add new GetAppRevisionNumber() method
- Introduce iUIBlock interface for UI layouts, components, ...
- Introduce BlockRenderer to properly render blocks
- Add "render_block" function to TwigHelper to render blocks directly from TWIG
- Refactor layouts and components into proper block classes to fit the new architecture
