allow teleporting and warps at edges of the map

TShockAPI/TSPlayer.cs

@@ -313,11 +313,35 @@ namespace TShockAPI
             try
             {
                 int num = (size - 1)/2;
-                SendData(PacketTypes.TileSendSquare, "", size, (x - num), (y - num));
+		int m_x=0;
+		int m_y=0;
+
+		if (x - num <0){
+		   m_x=0;
+		   }else{
+		   m_x = x - num;
+		   }
+
+		if (y - num <0){
+		   m_y=0;
+		   }else{
+		   m_y = y - num;
+		   }
+
+		if (m_x + size > Main.maxTilesX){
+		   m_x=Main.maxTilesX - size;
+		   }
+
+		if (m_y + size > Main.maxTilesY){
+		   m_y=Main.maxTilesY - size;
+		   }
+
+                SendData(PacketTypes.TileSendSquare, "", size, m_x, m_y);
                 return true;
             }
             catch (IndexOutOfRangeException)
             {
+
                 // This is expected if square exceeds array.
             }
             catch (Exception ex)