Blanket Permission Highlighter per BrickGrass

Highlights AO3 users listed as having blanket permission to podfic their works in green, as per Rindle's https://www.fpslist.org/.

Works which do not have a blanket permission author can also be filtered out from search results.

If you have any trouble using/installing this extension, please do go ahead and let me know by emailing me, I'm happy to help. If you think you've found a bug, go ahead and create an issue on the github repo for this extension: https://github.com/BrickGrass/Blanket-Permission-Highlighter.