[Welcome] [Feature Request] Allow for different embed titles between greetings and goodbyes

[JuanDelPueblo]

Self-explanatory, can be done in the same way as [p]welcomeset embed image greeting/goodbye <content> I would like for different embed titles so I can have a "Welcome to this server!" title on the greeting, and have a "Goodbye :(" title on the goodbye, but right now they share the same title which would make setting an embed title pointless in my use case.