1714 add urllib to masssuperct

[Luis-manzur]

• Fix masssuperct scraper by switching from JSON API to HTML page scraping and using urllib to bypass Cloudflare TLS fingerprinting
• Abstract the urllib download_content logic into AbstractSite._download_content_urllib() so scrapers with use_urllib = True no longer need to override download_content
  individually
• Remove duplicated download_content overrides from lactapp_3 and masssuperct

[grossir]

This looks good.

I tested the lactapp_3 and the kanctapp scrapers (affected by these changes)

This backscraper also works