Show Supporter Number Next To Release on Discography Pages

[sabjorn]

Note: Requested by user through email, reproduced in part below:

One feature I would love to be added if at all possible, would be to be able to see the number of supporters displayed on the record labels releases page. This would be a great way of finding the most popular tracks.

Basically, next to each release on a discography page would be a "supporter" count. The supporters of a release are displayed on each release's page.

Implementation Details:
Unless an API endpoint can be found for this, implementing this feature will require scraping releases to create the count. In this case it would be best to cache this calculation to prevent excessive requests to bandcamp.

Additional notes:
being able to turn on/off would be nice

[sabjorn]

looks like the data in the header of a page (which will be used by #72) also contains "sponsors" with a count. So getting this data may be very easy :D

[sabjorn]

this feature is superseded by the playlists feature since it completely obliterates the discography page. Perhaps this data could be useful in the future if playlists end up taking the form of a spreadsheet style interface and thus allow users to have this data as part of their selection.