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/Message.js

@@ -157,6 +157,12 @@ class Message extends Base {
      * @private
      */
     this._edits = [];
+
+    /**
+     * Whether this message has been deleted
+     * @type {boolean}
+     */
+    this.deleted = false;
   }
 
   /**
@@ -341,9 +347,9 @@ class Message extends Base {
    * @readonly
    */
   get deletable() {
-    return this.author.id === this.client.user.id || (this.guild &&
+    return !this.deleted && (this.author.id === this.client.user.id || (this.guild &&
       this.channel.permissionsFor(this.client.user).has(Permissions.FLAGS.MANAGE_MESSAGES)
-    );
+    ));
   }
 
   /**