#18324: set_payload now correctly handles binary input.

This also backs out the previous fixes for for #14360, #1717, and #16564.
Those bugs were actually caused by the fact that set_payload didn't decode to
str, thus rendering the model inconsistent.  This fix does mean the data
processed by the encoder functions goes through an extra encode/decode cycle,
but it means the model is always consistent.  Future API updates will provide
a better way to encode payloads, which will bypass this minor de-optimization.

Tests by Vajrasky Kok.

Lib/email/message.py

@@ -275,6 +275,8 @@ class Message:
         Optional charset sets the message's default character set.  See
         set_charset() for details.
         """
+        if isinstance(payload, bytes):
+            payload = payload.decode('ascii', 'surrogateescape')
         self._payload = payload
         if charset is not None:
             self.set_charset(charset)