Change Busty's name to the currently playing artist and song name

[anoadragon453]

Such that people can easily check which song is currently playing. Otherwise they need to check the pinned message and try and keep the current or previous song in mind.

We only have 32 characters to play with, so song names may be truncated. If this happens, we should end the title with an ellipsis character: …

It would be fun to place an emoji in front as well. Perhaps a random emoji (excluding some not as fun ones, like the flags) that switches per artist.

[anoadragon453]

Nicks are only allowed to be 32 characters or fewer (else Discord will reject the action). However it appears that Discord won't show 32 characters in all stage elements, as shown in the screenshots below:

The longest it will show is 27, and the shortest is 19. Still, we should set Busty's nick to the longest we can in case Discord changes their UI in the future.

Also Discord will add the ellipsis. So there's no need for us to do that manually.

[anoadragon453]

Done in #8 and #10.