citra_qt, core: game list "Open XXX Location" improvements

src/core/loader/loader.h

@@ -157,6 +157,15 @@ public:
         return ResultStatus::ErrorNotImplemented;
     }
 
+    /**
+     * Get the extdata id for the application
+     * @param out_extdata_id Reference to store extdata id into
+     * @return ResultStatus result of function
+     */
+    virtual ResultStatus ReadExtdataId(u64& out_extdata_id) {
+        return ResultStatus::ErrorNotImplemented;
+    }
+
     /**
      * Get the RomFS of the application
      * Since the RomFS can be huge, we return a file reference instead of copying to a buffer