Add Bandcamp support

[doZennn]

Only works on artists not using a custom domain. https://radicaldreamland.bandcamp.com/ works, https://music.disasterpeace.com/ doesn't. Can probably get around this by checking every single page if it's from Bandcamp. But I'm not familiar enough with the extension to make sure it's done properly.

There also may be problems with covers not showing up.

Supports:

• Title
• Artist
• Album
• Cover
• Duration
• Position
• Progress
• PlayPause, Next, Prev
• Volume
• State
• Status

[tjhrulz]

I would add this but due to the lack of control support this does not provide a better experience than the generic script (Which the reason it was born was because of bandcamp). However I will look into doing another pass a better bandcamp integration.