Notion of SerializedUrl removed, now just using strings

src/editor/js/structures/graph/node.ts

 import { Graph } from "./graph";
 import { GraphElement } from "./graphelement";
 import { NodeType } from "./nodetype";
-import { SerializedURL } from "../helper/serializedurl";
 import { Link } from "./link";
 import { GLOBAL_PARAMS } from "../helper/serializableitem";
 
@@ -21,10 +20,10 @@ export class Node extends GraphElement {
     public label: string;
     public description: string;
     public type: NodeType;
-    public icon: SerializedURL;
-    public banner: SerializedURL;
-    public video: SerializedURL;
-    public references: SerializedURL[];
+    public icon: string;
+    public banner: string;
+    public video: string;
+    public references: string[];
 
     constructor(graph: Graph = undefined) {
         super(graph);

src/editor/js/structures/helper/serializedurl.ts

-import {GLOBAL_PARAMS, SerializableItem} from "./serializableitem";
-
-const URL_PARAMS = ["link", ...GLOBAL_PARAMS];
-
-export class SerializedURL extends SerializableItem {
-    public link: string;    // The full url
-
-    // TODO: URL validator
-
-    serialize(): any {
-        return this.serializeProperties(URL_PARAMS);
-    }
-}
\ No newline at end of file