Note locking support

app/assets/javascripts/app/controllers/editor.js

@@ -283,6 +283,12 @@ angular.module('app')
       this.changesMade();
     }
 
+    this.toggleLockNote = function() {
+      this.note.setAppDataItem("locked", !this.note.locked);
+      this.note.setDirty(true);
+      this.changesMade();
+    }
+
     this.toggleArchiveNote = function() {
       this.note.setAppDataItem("archived", !this.note.archived);
       this.note.setDirty(true);

app/assets/javascripts/app/models/api/item.js

@@ -193,6 +193,10 @@ class Item {
     return this.getAppDataItem("archived");
   }
 
+  get locked() {
+    return this.getAppDataItem("locked");
+  }
+
   /*
     During sync conflicts, when determing whether to create a duplicate for an item, we can omit keys that have no
     meaningful weight and can be ignored. For example, if one component has active = true and another component has active = false,