Patch by Elvis Praskevichus.  (+ issue #25070)

Patch by Elvis Pranskevichus

invalid memory.

Fixed the case of the "Ctrl-" prefixes.

Fixed the case of the "Ctrl-" prefixes.

Fixed the case of the "Ctrl-" prefixes.

This changes the equivalent functions listed for the Base-64, hex and Quoted-
Printable codecs to reflect the functions actually used. Also mention and
test the "quotetabs" setting for Quoted-Printable encoding.

Remove notice that was backported in revision 50527a1b769c.

Patch from Tim Tisdall.

Reported by Nat Dunn on docs@

PyUnicode_AsEncodedString() instead of calling the encode() method of the
host, to handle correctly custom string with an encode() method which doesn't
return a byte string. The encoder of the IDNA codec is now called directly
instead of calling the encode() method of the string.