Move treat-as-file enum to better namespace

SabreTools.DatTools/Enums.cs

@@ -0,0 +1,12 @@
+namespace SabreTools.DatTools
+{
+    /// <summary>
+    /// Determines which files should be skipped in DFD
+    /// </summary>
+    public enum SkipFileType
+    {
+        None = 0,
+        Archive,
+        File,
+    }
+}