refactor: remove user bot methods (#2559)

* [WIP] Remove user bots

* more backend userbot removal

* Add mfaEnabled back

* revert client presences store removal

* partially revert getAuth changes

* remove more no longer used children of ClientUserGuildSettings

* fix a bug with this pr and TextBasedChannel.applyToClass

* remove a syncGuilds reference

* more user bot data handling

* various guildSync cleanup

* bots can't call logout

Had the user/bot portions of the code mixed up. Though, does this need to be a promise anymore?

* make ClientManager#destroy() sync

It nolonger needs to be a promise, and nothing depended on it being a promise that I can tell.

* requested change

* Fix massive error

* no longer used as it's userbot only

src/structures/ClientApplication.js

@@ -170,26 +170,6 @@ class ClientApplication extends Base {
     } });
   }
 
-  /**
-   * Resets the app's secret.
-   * <warn>This is only available when using a user account.</warn>
-   * @returns {Promise<ClientApplication>}
-   */
-  resetSecret() {
-    return this.client.api.oauth2.applications[this.id].reset.post()
-      .then(app => new ClientApplication(this.client, app));
-  }
-
-  /**
-   * Resets the app's bot token.
-   * <warn>This is only available when using a user account.</warn>
-   * @returns {Promise<ClientApplication>}
-   */
-  resetToken() {
-    return this.client.api.oauth2.applications[this.id].bot.reset.post()
-      .then(app => new ClientApplication(this.client, Object.assign({}, this, { bot: app })));
-  }
-
   /**
    * When concatenated with a string, this automatically returns the application's name instead of the
    * ClientApplication object.