[CJL] Set sounds for a role

[sadisticdane]

takes ages settings everyones sound, wish there was an option to change whole groups. primarily leave sounds.
so if an admin leaves a chat everyone hears admin.mp3, if a standard member they'l hear member.mp3, and so on. with more people joining discord its hard settings sounds for each members.

[tmercswims]

I like this idea. I think the proper implementation would be to have sort of 2 levels of sounds: one for roles, and one for the specific members. When a user joins/leaves a channel, their specific sound is played if they have one, or the sound for their highest role (that has a sound) is played if they don't have a user-specific one.

I won't be doing this for v2, but I like the idea, so I'll do it for v3 rewrites.