Py2app

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* 319: Add ad-hoc signature for application bundles

ARM64 binaries on macOS 11 must be signed, even if it is only an ad-hoc signature.
py2app will now add an ad-hoc code signature.

* 300: Add support for ARM64 and Universal 2 binaries

.. note:: Support is highly experimental, these stubs have not been tested yet.

* 299: Fix build error when building with the copy of Python 3 shipped
with Xcode.

* 281: Generated bundle doesn't work on macOS 10.9 and 10.10.

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* PR 277 (Christian Clauss): Fix some Python 3 issues

* 276: Rebuilt the binary stubs on a 10.12 machine to fix launching

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* Migrate to GitHub

* 274: Fix an issue in the PyQt5 recipe

* Fix issue with emulate-shell-environment option on macOS 10.15 (Catalina)

* 269: Py2app didn't work with Python 3.8

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* 251: Add recipe for "botocore"

* 253: "python setup.py py2app -A" creates invalid bundle from "venv" virtual environments

* Updated recipe for PySide2 and new recipe for Shiboken2

Patch by Alberto Sottile.

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* 250: Add recipe for "six.moves", which also works when the six
library is vendored by other packages

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* 247: The new tkinter recipe didn't work properly for installations
that do use a framework install of Tcl/Tk.