[SabreTools, DatFile, Enums, Flags] Overhaul splitting

SabreTools.Library/Data/Enums.cs

@@ -258,18 +258,6 @@
 		SHA512,
 	}
 
-	/// <summary>
-	/// Determines how the DAT will be split on output
-	/// </summary>
-	public enum ExternalSplitType
-	{
-		None = 0,
-		Extension,
-		Hash,
-		Level,
-		Type,
-	}
-
 	/// <summary>
 	/// Determines forcemerging tag for DAT output
 	/// </summary>