Subpath hierachies

[oberstet]

Currently, Web transport path configuration cannot nest paths.

We could have a new subpath type path, which can serve as parent to other services:

{
   "type": "web",
   "endpoint": "tcp:8080",
   "paths": {
      "/": {
         "type": "static",
         "directory": ".."
      },
      "wamp": {
         "type": "path",
         "paths": {
            "ws": {
               "type": "websocket",
               "url": "ws://localhost:8080/ws"
            },
            "lp": {
               "type": "longpoll",
               "url": "ws://localhost:8080/ws"
            }
         }
      }
   }
}