* Combat/Threat rewrite (PR #19930) prep work. Mostly refactors, and a compatibility layer on ThreatManager/HostileReference that allows scripts to be changed already. (cherry picked from commit e2a1ccd118d129b96e09ff1a15ed0adb1d4a3897)
* Combat/Threat rewrite (PR #19930) prep work. Mostly refactors, and a compatibility layer on ThreatManager/HostileReference that allows scripts to be changed already. (cherry picked from commit e2a1ccd118d129b96e09ff1a15ed0adb1d4a3897)