Core/Cheats: Power - set max power on all powers initially + on regenerate

Port From (https://github.com/TrinityCore/TrinityCore/commit/079bc7800eeb1f5ae8201e59f91d92e980680bcb)

Source/Game/Chat/CommandHandler.cs

@@ -389,7 +389,7 @@ namespace Game.Chat
             playerGuid = ObjectGuid.Empty;
             playerName = "";
 
-            if (!args.Empty())
+            if (args != null && !args.Empty())
             {
                 string name = ExtractPlayerNameFromLink(args);
                 if (string.IsNullOrEmpty(name))

Source/Game/Chat/Commands/CheatCommands.cs

@@ -123,7 +123,12 @@ namespace Game.Chat.Commands
             }
             else if (argstr == "on")
             {
-                handler.GetSession().GetPlayer().SetCommandStatusOn(PlayerCommandStates.Power);
+                Player player = handler.GetSession().GetPlayer();
+                // Set max power to all powers
+                for (PowerType powerType = 0; powerType < PowerType.Max; ++powerType)
+                    player.SetPower(powerType, player.GetMaxPower(powerType));
+
+                player.SetCommandStatusOn(PlayerCommandStates.Power);
                 handler.SendSysMessage("Power Cheat is ON. You don't need mana/rage/energy to use spells.");
                 return true;
             }

Source/Game/Entities/Player/Player.cs

@@ -3812,6 +3812,9 @@ namespace Game.Entities
                 }
             }
 
+            if (GetCommandStatus(PlayerCommandStates.Power))
+                curValue = maxPower;
+
             if (m_regenTimerCount >= 2000)
                 SetPower(power, curValue);
             else