Added queue for alerts, so that they aren't all firing off in one time.
Updated ready to check if the root has the MainWin node (When running a
specific scene, may not be present)
Added function to queue up alert, and processing of queued alerts.
This will be a class to handle events, such as custom events implemented
in GDScript/Chat Commands, as well as Twitch Events, such as Raids,
Shoutouts, etc, etc.
