Called when a key-value pair is set on an entity, either by the engine (for example when map spawns) or Entity:SetKeyValue.
See ENTITY:KeyValue for a hook that works for scripted entities.
See WEAPON:KeyValue for a hook that works for scripted weapons.
infodecal entities similar to the blue graffiti text behind the big building with numbered floors on gm_construct.
texture keyvalue cannot be retrieved from