Enhance HTTPResponse.readline() performance

- Remove configuration settings from removed _sha3.vcxproj
- Don't try to build configurations of _testembed that don't exist
  (namely, PGInstrument and PGUpdate)

Only test the error handler. The encoding is not ASCII on Windows: it may the
OEM or ANSI code page.

to get LC_CTYPE constant on Windows.

:py:data:`sys.stdin` and :py:data:`sys.stdout` are now using the
``surrogateescape`` error handler, instead of the ``strict`` error handler.

* Tolerate 10 seconds instead of 3 seconds for slow test
* Faster test, use sleep of 100 ms instead of 1 sec
* Replace a number of iterations with an explicit deadline for the timeout

(Windows code page 65001, Microsoft UTF-8).

tables for base32, ascii85 and base85 codecs in the base64 module, and delay
the initialization of the unquote_to_bytes() table of the urllib.parse module,
to not waste memory if these modules are not used.

base32, ascii85 and base85 codecs in the base64 module, and delay the
initialization of the unquote_to_bytes() table of the urllib.parse module, to
not waste memory if these modules are not used.

Changes of 3.4 after 3.4.0 must already be present in the 3.4 branch.

In fact, items were already present by Misc/NEWS format was improved.

correct the fix for #20637; allow slot descriptor inheritance to take place before creating cached keys