[AdminComponent] Remove trailing slash (Results in a route with a double slash otherwise)
[Routing] Change admin prefixes to /admin, load custom route type
[AdminControllerInterface] Add configure method
[AdminController] Change from constructor injection to setting injection. Add configure method to access the admin pool and current admin instance
[Compiler Pass] Change second argument in addMethodCall to an array
[Admin Extension] Load controllers and default admins yaml files
[Services] Take controllers out of services.yml
[AdminController] Swap request for Request Stack
[RouteBuilder] Add trailing slash to view route
[RouteCollection] Swap controller to service
[ReadMe] Update README