Addition of RequestSkillCoolTime.

Thanks to Fakee.

L2J_Mobius_C4_ScionsOfDestiny/java/org/l2jmobius/gameserver/model/Timestamp.java

@@ -98,11 +98,13 @@ public class Timestamp
 		{
 			return 0;
 		}
+		
 		final long remainingTime = Math.max(_stamp - System.currentTimeMillis(), 0);
 		if (remainingTime == 0)
 		{
 			_stamp = 0;
 		}
+		
 		return remainingTime;
 	}
 	
@@ -116,11 +118,13 @@ public class Timestamp
 		{
 			return false;
 		}
+		
 		final boolean hasNotPassed = System.currentTimeMillis() < _stamp;
 		if (!hasNotPassed)
 		{
 			_stamp = 0;
 		}
+		
 		return hasNotPassed;
 	}
 }