N°2847 - Rework of the global iTopWebPage layout (Part II)

- Optimize TWIG templates includes (don't pass context to autonomous components)
- Preliminary work of the top bar and breadcrumbs features
- Removal of images dedicated to the breadcrumbs feature

css/backoffice/utils/helpers/_all.scss

@@ -18,4 +18,5 @@
 
 @import "typography";
 @import "elevation";
-@import "misc";
+@import "misc";
+@import "font-icon";