[MERGED PR] feature: apply sonic stun from flashbang to deaf mobs

[mbc]

pr is good. deaf has downsides but they all revolve around communication. the main way Deaf trait is used is to gain immunity to security-issue flashbangs, commonly by a solo antagonist who's trying to do rampage stuff. if they only care about killing people, not being able to communicate isn't much of a downside at all. that communication downside only harms the crew - preventing them from being able to negotiate, provoke, or otherwise talk to their silent killer.

also opposed to half-measures like giving deaf people partial defense against flashbangs. if it's better for combat it'll keep getting used in the same way.