Issue #12892: The utf-16* and utf-32* codecs now reject (lone) surrogates.

The utf-16* and utf-32* encoders no longer allow surrogate code points
(U+D800-U+DFFF) to be encoded.
The utf-32* decoders no longer decode byte sequences that correspond to
surrogate code points.
The surrogatepass error handler now works with the utf-16* and utf-32* codecs.

Based on patches by Victor Stinner and Kang-Hao (Kenny) Lu.
diff --git a/Misc/ACKS b/Misc/ACKS
index 34fac02..436b9ac 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -783,6 +783,7 @@
 Jason Lowe
 Tony Lownds
 Ray Loyzaga
+Kang-Hao (Kenny) Lu
 Lukas Lueg
 Loren Luke
 Fredrik Lundh