refs #9192
- Moving towards a centralised concept of routing / routes
- The base router now wraps express router, and offers us the features we need
- Site Router is the parent router, it gets initialised with all of our default routing
- App Router is a sub router for apps - apps register their routes/routers onto it.
- TODO: refactor channels subrouter to work this same way
- MAYBE: move the app router to the apps service
refs #9192
- Instead of `setupRoutes` function in apps that gets passed a router, there is now a registerRouter function as part of the proxy
- Moved towards a route service, which will know about all routes
- Using classes to abstract away shared behaviour
Notes:
- changing the app proxy didn't result in a test failure!
- structure of route service is totally new and may change a lot yet
