feat(battle-engine): close the AI-simulation subsystem (verbatim)

Copied the 89 uncopied AI*SimulationUtility/extension files defining the
AIVirtualCard/AIVirtualField extension methods; the compile loop then auto-closed
the revealed type deps (~3049 files total, drift-clean). 10.0k -> 62 errors.

SVSim.BattleEngine/Engine/RegisterExtraTurn.cs

@@ -0,0 +1,37 @@
+using System.Collections.Generic;
+
+public class RegisterExtraTurn : RegisterActionBase
+{
+	private int _extraTurnNum;
+
+	public RegisterExtraTurn(int turnNum, bool isSelf)
+	{
+		_extraTurnNum = turnNum;
+		IsSelf = isSelf;
+	}
+
+	public override bool IsUseLotCard(RegisterLotCardBase lot)
+	{
+		return false;
+	}
+
+	public override Dictionary<string, object> MakeSendData()
+	{
+		return new Dictionary<string, object>
+		{
+			{
+				RegisterTool.OrderListParameter.count.ToString(),
+				_extraTurnNum
+			},
+			{
+				NetworkBattleDefine.NetworkParameter.isSelf.ToString(),
+				IsSelf ? 1 : 0
+			}
+		};
+	}
+
+	public override string GetUriMsg()
+	{
+		return RegisterTool.OrderListParameter.exTurn.ToString();
+	}
+}