[DatTools] Add lock to adding rom

The idea is that this will help in the future to make Parsing go quicker

SabreTools.Helper/Tools/DatTools.cs

@@ -1452,6 +1452,8 @@ namespace SabreTools.Helper
 					rom.HashData.Size = -1;
 				}
 
+				lock (datdata.Files)
+				{
 					key = rom.HashData.Size + "-" + rom.HashData.CRC;
 					if (datdata.Files.ContainsKey(key))
 					{
@@ -1473,6 +1475,7 @@ namespace SabreTools.Helper
 					datdata.SHA1Count += (String.IsNullOrEmpty(rom.HashData.SHA1) ? 0 : 1);
 					datdata.NodumpCount += (rom.Nodump ? 1 : 0);
 				}
+			}
 
 			return datdata;
 		}