Add missing hidden property

src/v1/content.ts

@@ -4,6 +4,7 @@ export interface Content {
     type: string;
     title: string;
     subtitle?: string;
+    hidden?: boolean;
     conditional?: boolean;
     conditionResolver?: ScoreResolver | ChoiceResolver;
 }

src/v2/epoc.ts

@@ -201,6 +201,11 @@ export interface Screen {
      */
     subtitle?: string;
 
+    /**
+     * Specifies if the screen appears in the detailed table of contents
+     */
+    hidden?: boolean;
+
     /**
      * List the screen content ids
      */