Flake: use new window functions (partial_tukey, punchout_tukey).

CUETools.Codecs.FLAKE/WindowFunction.cs

@@ -2,11 +2,17 @@
 {
     public enum WindowFunction
     {
+        None = 0,
         Welch = 1,
         Tukey = 2,
         Hann = 4,
         Flattop = 8,
         Bartlett = 16,
-        TukeyFlattop = 10
+        TukeyFlattop = 10,
+        PartialTukey = 32,
+        TukeyPartialTukey = 34,
+        TukeyFlattopPartialTukey = 42,
+        PunchoutTukey = 64,
+        TukeyFlattopPartialTukeyPunchoutTukey = 106,
     }
 }