Python-docx-ng

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- Merged pull requests from original repository which are < 2 years old.

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- Small build changes and Python 3.8 version changes like collections.abc location.

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- Revert use of expanded package directory for default.docx to work around setup.py
problem with filenames containing square brackets.

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- Fix gap in MANIFEST.in that excluded default document template directory

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- Add support for headers and footers

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- Add _Row.height_rule
- Add _Row.height
- Add _Cell.vertical_alignment
- Fix 455: increment next_id, don't fill gaps
- Add 375: import docx failure on --OO optimization
- Add 254: remove default zoom percentage
- Add 266: miscellaneous documentation fixes
- Add 175: refine MANIFEST.ini
- Add 168: Unicode error on core-props in Python 2