Call of Duty: Black Ops Cold War. Screenshot: Treyarch, ActivisionThe budgets for big video games are among the most closely guarded secrets in the gaming industry.So it is surprising that, late last month, an Activision executive spelled out the development costs for three of the games in the company’s best-selling Call of Duty franchise.In a court filing reviewed by Game File that has not been previously reported, Patrick Kelly, Activision’s current head of creative on the Call of Duty franchi...