Move the router classes to a namespace and expose it with a public interface

apps/files_sharing/appinfo/routes.php

lib/base.php

lib/private/appframework/routing/routeconfig.php

lib/private/route/route.php

lib/private/route/router.php

lib/private/server.php

lib/public/appframework/app.php

lib/public/iservercontainer.php

lib/public/route/iroute.php

lib/public/route/irouter.php

tests/lib/appframework/routing/RoutingTest.php