Implement background updates

[i-am-gizm0]

• Member count channel
  In TS, when someone joins or leaves the server, we update the name of a voice channel with the new number of members. TS Implementation
• VC ping role update
  When someone joins or leaves a voice channel in a server, we give/remove a special @vc role so people can mention others in the call. TS Implementation

[Muirrum]

You can do both of these by implementing additional functions on the EventHandler impl for the Handler struct. This event will fire when a member joins, and this one will fire when a member leaves. This one will fire whenever a voice state updates

[Muirrum]

Also i'm wondering - does anyone use the @vc role?

[i-am-gizm0]

I've seen it used a few times but we haven't had many people in vc at once in a while