Application - adding check for modules key in config.
Vastly simplifying routing - now without prefixes.

Prefixes were set to substitute :prefix in module routes - but now
having the need for a :module variable for routing to controllers as
services (e.g. controller(::$module.controller.foo)) makes this
impractical. Instead, simply pass $module and $prefix into the function
returned by a module's routes.php.