Emeraldtree

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Fixes:

- html parser: fix extraction of encoding from meta element
- use raw string for regex, fixes "DeprecationWarning: invalid escape
sequence \s" and others.

New features:

- include version infos into emeraldtree.__init__

Other changes:

- packaging modernized / enhanced: pyproject.toml, MANIFEST.in, setuptools-scm
- requires Python >= 3.9 now (dropped Python 2.x, removed "six")
- add github actions CI, remove travis CI config
- rst markup fixes / clean ups
- use tox for testing

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Fixes:

- fix setup.py - platform and no download_url
- invalid output from HTML converter parsing preformatted code, multiline
paragraphs: part 2 of 2 fixes moin2 516

Other changes:

- ported to Python 2.7 / >= 3.3 using six

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First release on PyPI.