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

- iTopWebPage: Extract processing in dedicated functions
- iTopWebPage: Add tooltips base feature
- iTopWebPage: Fix JS dictionaries
- iTopWebPage: Extract inline JS to dedicated file
- Top bar: Visual improvements
- Nav. menu: Visual improvements
- Nav. menu: Tooltip improvement
- Nav. menu: Toggle state preference saved
- Nav. menu: Add menus filter feature
- Breadcrumbs: Handle elements overflow

css/backoffice/pages/_base.scss

@@ -42,10 +42,11 @@ body{
 	@extend %ibo-font-ral-nor-100;
 }
 #ibo-navigation-menu{
-	z-index: 1;
+	z-index: 20;
 }
 #ibo-page-container{
 	position: relative;
+	z-index: 10;
 	height: 100%;
 	overflow: auto;
 	flex-grow: 1;