KB Productions scraper: add sites

[tj2222]

KB Productions scraper changes:

• Adds scene support for xxxtryout.com, trashyneverclassy.com, and cosplayxgirls.com
• Adds performer support for xxxtryout.com, trashyneverclassy.com, cosplayxgirls.com, and passionpov.com
  • Tolerate LB as an alternative to LBS when looking for weight units (e.g. trashyneverclassy.com)
  • Check details field when bio isn't present (e.g. cosplayxgirls.com)

Testing:

• Scraped a few scenes & performers from each new site
• Scraped a few performers from already-supported sites to verify no regression

LLM use: just some tab completion in Antigravity IDE when it was able to figure out the patterns.

Other notes:

• I tried adding all of the other sub-studios currently listed under KB Productions on SDB.
  • A4DX appears to me to work with the KB Productions python scraper but currently has its own Community Scraper, so I decided to keep things as they are. It would probably be a good idea to replace the dedicated A4DX scraper with this one if someone more familiar with the studio and any corner cases can verify that there's no issue with this.
  • All of the others use some different or older format that isn't drop-in compatible with the current scrapers.
• The Python scrapers (and probably xpath scraper) are really supporting the Paysite.com/Your Paysite Partner platform, which is imperfectly correlated with studios under KB Productions. It would probably be good to rename it as such, for clarity, and to investigate what other studio sites could be supported. Not opening that "can" right now though because it may contain worms.