Tabler

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Changes
* Add support for Python 3.12
* Drop support for Python 3.7

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Changes
* Remove support for Python 3.6

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Changes
* Raise ValueError when passing an unrecognised key to TableRow.__getitem__ or TableRow.__setitem__.
* Allow a template to be passed when creating an HTML table.
* Opening an empty file raises ValueError.
* Dropped support for Python 3.5.
* Opening empty files raises ValueError.
* Using an invalid index type to select a cell now raises a ValueError.

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New
* Consistent handling of files with varying row length.

Changes
* Use Poetry for packaging.
* The `get_column()` and `update_column()` methods of TableRow have been removed as they are unnecessary. Use `row[index]` and `row[index] = value` instead.

Fixes
* Tabler can now open `ODS` files that were created with tabler.

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New
* Python 3.5 compatibilty.

Changes
* Replace ezodf dependency with pyexcel-ods.

Fixes
* All files that are opened are closed again.
* Commandline output goes to STDERR, not STDOUT.