Performance: rework in Eventcallback "creatureOnHear"

[dudantas]

Apparently, the callback is being called for all creatures that are outside of IDLE, even for monsters. Monsters "do not need" to trigger the event for players (it’s the monsters that should "react" to the event triggered by players). From the analysis, it seems that monsters are calling the event for every player on the map.

NOTE: need disable "metrics lua" if metrics is disabled in the compilation level.