Update 8.1.3

CNG: Updated unit portraits by cjprince (added in previous hotfixes)
CNG: Free advances upon continuing into a new campaign no longer increase crewman level
CNG: Crewman level cap now increased to 75
FIX: Several minor bugs fixed (in previous hotfixes), thanks to Minty on the Discord
FIX: Messages about crewmen being shaken were appearing before message about the crewman being KIA
FIX: Minor rounding error in displayed total VP modifier for campaign options
FIX: Progression toward King of Diamonds Steam achievement not being recorded properly