Unnecessary find of battle events has been removed from "BattleController".
Field "last_battle_event_view_time" has been added to Battle Participant.
Usage of "Participant::last_battle_event_view_time" has been applied.
Battle runner start has been moved inside "Manager".
Controls release bug at battle room js has been fixed.
Update of "Participant::last_battle_event_view_time" has been fixed.