Ycecream

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Removed __all__ from the pprint source, which prevented ycecream to work properly.

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Changed prepare.py to dynamically make setup.py (from setupx.py and readme.md).

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Ycecream now supports the underscore_number functionality of pprint
(even for Python < 3.10, but not Python 2.7).
Therefore, a new attribute underscore_number (abbreviated un) is introduced.
This attribute is False by default.
Example usage:
powers = [10**i for i in range(8)]
y(powers, underscore_numbers=True)
results in
y| powers: [1, 10, 100, 1_000, 10_000, 100_000, 1_000_000, 10_000_000]

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Updated readme and made it available on PyPI.
Checked compatibility with Python 3.12.

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It is now possible to suppress the parent function/method when line numbers are shown.
To do so, just use one of
show_line_numbers = "n"
show_line_numbers = "no parent"
sln = "n"
sln = "no parent"
The readme file has been updated and corrected.

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A bug made that there was still a dependency: executing. Fixed.