Unit tests part 2

[JKingweb]

Now that my first batch of tests have been merged in #126 I thought I would post my second batch for those interested.

What's here was written some time ago now, and while I do plan to write some more tests, I'll have to re-familiarize myself with the specification first, so I don't expect this set to receive further commits barring feedback.

Coverage is currently as follows:

• Microformat type and property name splitting/matching
• Basic property parsing
• ID parsing
• textContent parsing
• Value class pattern parsing
• Value-title parsing
• Value class date parsing
• Implied property parsing
• Nested microformat parsing
• Link relation parsing
• Template handling
• Foreign content handling
• URL resolution
• URL normalization
• Backcompat processing
  • vocabularies
    • adr
    • vcard
    • vevent
    • hfeed
    • hentry
    • geo
    • hproduct
    • hrecipe
    • hresume
    • hreview
    • hreview-aggregate
    • hnews (?)
  • includes
  • multi-roots
  • mixed v2/backcompat
  • mixed v2 implied/backcompat
• Experimental features
  • lang parsing
  • alternate textContent parsing
  • Universal date parsing
  • Universal implied date
  • Implied time zone
  • Ignoring Tailwind types
  • srcset parsing