Add-ons [021] XenForo WebSockets 2.1.3

The getWebsocketsPromise method has been introduced, which allows you to execute code after the XF.Echo and XF.EchoManager objects are ready to work. This method should improve the stability of add-ons based on XenForo WebSockets.

Support for the Keep Alive XenForo system that updates the CSRF token when a tab is restored in browsers on mobile devices. This will get rid of such errors: Cookie Required To Use This Site, Security Error.

• Prevented error output on the user side in case of problems with the websocket server

Fixed:
In some cases, the channel name could be parsed incorrectl