Add support for middleware

src/http/routing/ActivatedRoute.ts

@@ -4,6 +4,8 @@ import {ResolvedRouteHandler, Route} from "./Route";
 export class ActivatedRoute {
     public readonly params: {[key: string]: string}
     public readonly handler: ResolvedRouteHandler
+    public readonly preflight: ResolvedRouteHandler[]
+    public readonly postflight: ResolvedRouteHandler[]
 
     constructor(
         public readonly route: Route,
@@ -20,6 +22,8 @@ export class ActivatedRoute {
         }
 
         this.params = params
+        this.preflight = route.resolvePreflight()
         this.handler = route.resolveHandler()
+        this.postflight = route.resolvePostflight()
     }
 }