refactor: apply structure to favorites and saveable things

src/core/base/SaveableThing.ts

@@ -17,14 +17,19 @@ import {SCThing, SCThingUserOrigin} from '../Thing';
 /**
  * An encapsulation of the data (e.g. a thing) that is saved, which provides additional information.
  */
-export interface SCSaveableThing<T extends SCThing> extends SCThing {
-  /**
-   * The contained data
-   */
-  data: T;
-
+export interface SCSaveableThingWithoutReferences extends SCThing {
   /**
    * Type of the origin
    */
   origin: SCThingUserOrigin;
 }
+
+/**
+ * An encapsulation of the data (e.g. a thing) that is saved, which provides additional information.
+ */
+export interface SCSaveableThing<T extends SCThing> extends SCSaveableThingWithoutReferences {
+  /**
+   * The contained data
+   */
+  data: T;
+}