Add multiclassing

Changes:
 + add multiclassing option
 + add edit and delete item for class

source/module/sheets/M5CharacterSheet.ts

@@ -433,6 +433,14 @@ export default class M5CharacterSheet extends ActorSheet {
 			}
 		});
 
+		html.find(".class-item-edit").on("click", async (event) => {
+			this.actor.items.find((x) => x.type === "class").sheet.render(true);
+		});
+
+		html.find(".class-item-delete").on("click", async (event) => {
+			this.actor.items.find((x) => x.type === "class").delete();
+		});
+
 		// Drag & Drop
 		const dragDrop = new DragDrop({
 			dragSelector: ".items-list .item",