Enforce Ephemeral Role Ordering

[ewohltman]

The order of roles created by Ephemeral Roles should match the order of voice channels in the server. This should be done automatically so that server owners would not have to manually sort and manage the roles that we create. The only role a server owner should have to manage is the Ephemeral Roles role itself, ensuring it to be as close to the top of the list of roles as possible and all ephemeral roles created for the voice channel should be directly underneath it.

If the position of a voice channel changes, we should automatically sort the appropriate role if it exists.

Additionally, if a voice channel is deleted we should delete the associated ephemeral role automatically.