refs #9192, #5091
- changed channels to use our new base class
- keep the flexible structure, so that channels can be reloaded
- I had to move the router into the route service otherwise we get circular dependencies
- Don't _really_ want to keep it like this - need a way to define base classes as shared
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
