[Feature Request] Add more graphs

[bloedboemmel]

First all: Amazing project, especially now with the performance boost :)

I think it only needs a little more graphs. Spotify can give you a lot of audio features for every song and i would be great to display them in a simple graph (maybe in the same look like "Artist listening distribution" or "Best artists for hour of day") You can see that in their own example:

There's also audio-analysis, but I think that would be too much I am not sure, if you are already saving the audio-features in the db, but i think it wouldn't affect the performance a lot.

Also I thought about adding a world map, which is showing your current "listening map" In my head it looks a little bit like that (but of course it's adjusted to the design of your_spotify):

Let me know what you think about this feature and I will try to implement it

EDIT: Added audio-analysis