Multiping.py

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- Nothing changed yet.

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- Add support for Python 3.13.

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- Add support for Python 3.9, 3.10, 3.11, and 3.12.
- Drop support for Python 3.6.
- Experimental Windows support (but not for --bluetooth).

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- Add support for --bluetooth pinging (via l2ping; requires root).
- Drop support for Python 3.5 and Python 2.7.

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- Moved to https://github.com/mgedmin/multiping.
- Added a setup.py, a changelog, and a bunch of other files.
- First release to PyPI.

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- Fix crash on terminal resize, when the terminal becomes too small.