some factorisation

system/scripts/items/advancement-sheet.js

@@ -14,35 +14,4 @@ export class AdvancementSheetL5r5e extends ItemSheetL5r5e {
             tabs: [{ navSelector: ".sheet-tabs", contentSelector: ".sheet-body", initial: "description" }],
         });
     }
-
-    getData() {
-        const sheetData = super.getData();
-        sheetData.data.dtypes = ["String", "Number", "Boolean"];
-
-        sheetData.data.isAdvancement = true;
-
-        return sheetData;
-    }
-
-    /**
-     * Subscribe to events from the sheet.
-     * @param html HTML content of the sheet.
-     */
-    activateListeners(html) {
-        super.activateListeners(html);
-
-        // Everything below here is only needed if the sheet is editable
-        if (!this.options.editable) {
-            return;
-        }
-    }
-
-    /**
-     * Update item with values from the sheet.
-     * @param event
-     * @param formData
-     */
-    _updateObject(event, formData) {
-        return this.object.update(formData);
-    }
 }