“Black Panther: Wakanda Forever” is still number one and “Strange World” tanked, but here’s what’s important: The three-day Thanksgiving box office weekend came to $95 million. In 2o19, this weekend’s total was $181 million; in 2018, $216 million. For all of 2019, only four weekends fell short of $100 million. The last time a Thanksgiving weekend grossed under $100 million was… never?