Hoard 2.0.2

Fixes from real Booth and Payhip library pages.

• Booth downloads: nothing downloaded, because Booth now draws its download buttons with a script. The
  addresses sit in placeholders, not links, so every item looked like it had no files. Hoard now reads
  them; the "Open in Browser" and Booth Library Manager variants of each file are skipped.
• Booth's free downloads are now included, with a switch in Settings.
• Payhip shops: Payhip keeps your purchases in each shop you bought from, on the shop's own address,
  with no single library. Add your shops in Settings under Payhip shops, and Hoard reads each one's
  library page and downloads from it. Signing in to Payhip opens a tab per shop. Importing a shop's
  saved page adds that shop for you.
• Only the shops you list count as Payhip's own sites, for links and downloads alike. Any other address
  is still refused.