feat: Add "deleted" property to multiple structures. (#2556)

* Add "deleted" property to "Message" structure

* Add "deleted" property to Multiple structures

Structures edited:
- Channel
- Emoji
- Guild
- Guild Member
- Role

* Update "deletable" getter

* Fix ESLint "no-trailing-spaces" errors

* Requested Change: Mark w/ bulkDelete

src/structures/Emoji.js

@@ -24,6 +24,12 @@ class Emoji extends Base {
      * @type {?Snowflake}
      */
     this.id = emoji.id;
+
+    /**
+     * Whether this emoji has been deleted
+     * @type {boolean}
+     */
+    this.deleted = false;
   }
 
   /**