Itables

Changed
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- The `itables` documentation now uses Jupyter Book (56)
- We have added a new `style` option in `itables.options` and in `show`, with a default value equal to `max-width:100%`.

Fixed
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- Add 'require_config.js' to the pip package (48)

Changed
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- When a JS function is created on the Python side, we export it as-is (without quotes) in the HTML file and don't use JS eval anymore.

Fixed
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- Fix the HTML output when `eval_functions=True`
- Display "Loading..." under the table header until the table is displayed with datatables.net
- `init_notebook_mode(all_interactive=False)` restores the original Pandas HTML representation

Fixed
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- Long column names don't overlap any more (28)

Fixed
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- Now `itables` also works in Jupyter Lab, Colab, Nteract, VS Code and PyCharm (3, 4, 26, 40), as we load the `datatables.net` library with an ES import when `require.js` is not available. Many thanks to [François Wouts](https://github.com/fwouts) for his precious help!

Changed
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- The `show` function (and `itables.options`) has a new argument `eval_functions`. When set to `True`, the nested strings passed to `datatables.net` that start with `function` are converted to Javascript functions.
- The HTML code for the datatables.net representation of the table is generated with an HTML template.
- We use f-strings and thus require Python >= 3.6