Table-enforcer

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* fix recode/validate access to sub-pkgs
* ignore .pytest_cache

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* Fixed import errors
* ignore test_chamber

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* Address import errors when not installed editable
* update README link to Usage_Demo
* ship docs/_static/Usage_Demo.html
* Updated Usage_Demo
* added to doctrings in main_classes

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* added readthedocs.yml
* Updated Usage_Demo and README

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* Updated tests for CompoundColumn
* CompoundColumn absorbs MTO/OTM-subclasses
* updated tests/files/demo_table*.csv
* updated docs/demo_notebook
* OTMColumn.input_columns must be len == 1
* amended tests for new OTMColumn
* main_classes: rewrite OTMColumn and general reorg
* BaseColumn method defs now sets api for subclasses
* Enforcer.columns is now simple list
* setup.cfg: whitelist varname df
* main_classes: restruct base classes + ComplexColumn
* main_classes: col takes table
* test_column: col takes table
* add testing files for MTOColumn
* ignore LibreOffice lock files
* OTMColumn: improved __doc__
* update_dataframe: call sig now has `validate`

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* main_classes: OTMColumn is functional
* updated testing for OTMColumn
* main_classes: replace Munch w/ Box (probationary)
* add python-box to reqs (probationary)
* conftest: modularize paths
* add testing for OTMColumn
* test_column: fix typos and style
* import all from main_classes
* Bump version: 0.1.5 → 0.2.0
* changelog(v0.2.0)
* Updated Docs version Usage_Demo.ipynb