Full Version Prerelease

Hotfixes from Testing Session (#183)

* Remove reference to deprecated function

* Move music channel management commands to their own group to avoid falling into channel checking problems

* Fixed an issue caused by moving default_role_id to its own table from Guild_info

* Fixed an issue where a VM child would not be created if the Parent VC was joined from another VM Child

* Correct musicchannel command in README

* Fixed an issue where youtu.be links would not work

* Fixed an issue where songs would not play when supplying the URL directly

* Added missing doc strings for EventCategoriesCog functions

Co-authored-by: Laura Demkowicz-Duffy <laura@laurademkowiczduffy.co.uk>
Co-authored-by: Fluxticks <benjigarment.appdev@gmail.com>