Show "Owned" status on Label page

[sabjorn]

In essence, it would be nice to know if you own a release (or a track from a release) on a label's page.

Full release ownership can have the same icon that is used by bandcamp on track/album pages to show you own it

Ideally -- partial ownership (a track or more but not full album) can be the same icon but cut in half (or something). However this would be difficult since it requires checking each album that a user has bought to find out if they own a track. One option for this is to have a local cache of this that is update occasionally.