Issue #28162: WindowsConsoleIO readall() fails if first line starts with Ctrl+Z
Issue #28163: WindowsConsoleIO fileno() passes wrong flags to _open_osfhandle
Issue #28164: _PyIO_get_console_type fails for various paths

Issue #28138: Windows ._pth file should allow import site

Patch by Eryk Sun.

Also update the classmethod and staticmethod doc strings and comments to
match the RST documentation.

regular expression now contains a (truncated) regex pattern.
Patch by Tim Graham.

Issue #25270: Prevent codecs.escape_encode() from raising SystemError when an empty bytestring is passed

Patch by Gergely Imreh and Markus Holtermann.

Patch by Mark Williams.

Patch by INADA Naoki.

Patch by iceboy.

Patch by Seth Michael Larson.

Patch by Kevin Conway.