Remove the deprecated magic proxy gevent.signal.

Leave behind the actual module gevent.signal, and the callable gevent.signal_handler.

Fixes #1596

Rework the way the in-place patcher works.

It now handles multiple imports better and doesn't pollute the namespace of an original module object if it happened to be pre-imported.

Fixes #1526

Packaging updates: use common_utility_include_dir for Cython, and don…

Packaging updates: use common_utility_include_dir for Cython, and don't install/include generated .c/.h files in wheels

docs/api/gevent.rst: fix typo

Refactor test__all__ to make it easier to spot errors. PyPy 7.2 on Windows has a failure with it; this won't fix it but is the first step. Make PyPy on windows non-optional so we catch such failures easier.

Fixes #1466

Add extra tests around selectors.

Fixes #1461 (hopefully).

Add greenlet-local implementation of contextvars

Include traceback in threadpool logging. Hoping to find where test__subprocess_interrupted is failing on Py2

These are greenlet local.

Fixes #1407

Fix Popen.communicate() to raise exceptions from reading the streams. 

And a general clean up of how the streams are read, ensuring we just have one greenlet. This avoids the 'reentrant call' errors that could prevent closing the streams on time.

Fixes #1510

The two-arg version of super depends on a module global, making it flaky during interpreter shutdown. Seen on Python 2: https://travis-ci.org/gevent/gevent/jobs/636366809#L501

Also some cleanups to subprocess handling during tests. Avoid a ref cycle.

Use Python allocators for the event loops

libuv 1.34.0

Even before this it was often right at the border on Py38 for some reason.

Fixes #1506.

We don't use the uv_random interfaces so exclude those files.

we don't support haiku so exclude that file.

The binary mode patch for #1282 is no longer needed after https://github.com/libuv/libuv/pull/2324

Not a 100% fix, but takes care of this.

Seems to have some sort of regression on libuv/windows, but only in
test__backdoor, which is weird anyway. I can't reproduce locally, and
test__backdoor is often flaky on windows anyway, so we'll skip it for now.

Not clear why.