Decaying auditory events

Now, we can update our AgentSenses update loop to prune both the bulletImpacts as well as bulletShots entries that are being stored on the blackboard. Pruning out old events prevents Lua from consuming large amounts of data, as both of these event types occur frequently:

AgentSenses.lua:

function AgentSenses_UpdateSenses(
    sandbox, userData, deltaTimeInMillis)

    PruneBlackboardEvents(
        userData.blackboard,
        "bulletImpacts",
        deltaTimeInMillis);
    
    PruneBlackboardEvents(
        userData.blackboard,
        "bulletShots",
        deltaTimeInMillis);
    
    ...

end