Improve typing doc

Closes #2019.

Verbatim C code using docstring syntax.

Rewrite memoryview[i][j] and similar obvious cases into the faster memoryview[i, j]

Closes #2012.

Closes #2002.

Closes #1999.

Closes #2008.

Signed-off-by: Stefan Behnel <stefan_ml@behnel.de>

Signed-off-by: Stefan Behnel <stefan_ml@behnel.de>

Implement a fake "cr_frame" property for Cython async coroutines that always returns None, just to prevent an AttributeError.
Closes #2000.

Put #include <structmember.h> later in the C code

See https://github.com/cython/cython/issues/1997

Add NPY_KEEPORDER to NPY_ORDER

Add declaration for tp_free

Use a saner way to check for non-trivial exception patterns. Not everything has an entry, but everything in a temp probably has a reason for being there.

Prevent calling into CPython with a live exception set while trying to match non-trivial exception patterns in an "except" clause.

Force retranslate Cython modules in "new_build_ext" if "-f" option is passed to "build_ext" command.

Closes #1972.

Multiple inheritance

Previously this was only possible through Python (requring the GIL),
sometimes implicitly (e.g. for string literals).

This fixes #1986.