Propagate async/await to List.copy(), Swimlane.copy() and callers

Since Card.copy() is now async, all callers in the copy chain need to
be updated to properly await the async operations:

- Make List.copy() async and await card.copy() in loop
- Make Swimlane.copy() async and await list.copy() in loop
- Fix mutateSelectedCards() to support async callbacks and method calls
- Make template copy event handler async in listBody.js

This also fixes the copySelection feature which was passing a callback
to mutateSelectedCards() but the function only supported method names.

models/lists.js

@@ -196,7 +196,7 @@ Lists.allow({
 });
 
 Lists.helpers({
-  copy(boardId, swimlaneId) {
+  async copy(boardId, swimlaneId) {
     const oldId = this._id;
     const oldSwimlaneId = this.swimlaneId || null;
     this.boardId = boardId;
@@ -217,13 +217,16 @@ Lists.helpers({
     }
 
     // Copy all cards in list
-    ReactiveCache.getCards({
+    const cards = ReactiveCache.getCards({
       swimlaneId: oldSwimlaneId,
       listId: oldId,
       archived: false,
-    }).forEach(card => {
-      card.copy(boardId, swimlaneId, _id);
     });
+    for (const card of cards) {
+      await card.copy(boardId, swimlaneId, _id);
+    }
+
+    return _id;
   },
 
   async move(boardId, swimlaneId) {

models/swimlanes.js

@@ -147,7 +147,7 @@ Swimlanes.allow({
 });
 
 Swimlanes.helpers({
-  copy(boardId) {
+  async copy(boardId) {
     const oldId = this._id;
     const oldBoardId = this.boardId;
     this.boardId = boardId;
@@ -163,12 +163,15 @@ Swimlanes.helpers({
     }
 
     // Copy all lists in swimlane
-    ReactiveCache.getLists(query).forEach(list => {
+    const lists = ReactiveCache.getLists(query);
+    for (const list of lists) {
       list.type = 'list';
       list.swimlaneId = oldId;
       list.boardId = boardId;
-      list.copy(boardId, _id);
-    });
+      await list.copy(boardId, _id);
+    }
+
+    return _id;
   },
 
   async move(toBoardId) {