Use route cache to store breadcrumb lists to speed things up

This version uses the route cache to not load all routes on every request:

• On cache:warmup all breadcrumb lists for all routes are stored in the route cache.

• This speeds up the whole process of breadcrumb building since the getting of the whole RouteCollection triggers the router to reload all routes from filesystem every time.

• Breadcrumb config is ultimately stored in _breadcrumbs in a routes defaults. This, because options do not get cached.

• It uses a custom routing loader and replaces the existing routing.loader service by aliasing thormeier_breadcrumb.routing.attach_breadcrumb_loader via compiler pass.

  If you are already replacing/extending the routing.loader service, use a compiler pass as well to make this work smooth!