Resolve "Add export functionality to absence statistics page"

Closes #267 (closed)

added part::frontend prio::2 source::customer::kath type::feature labels

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• 89930f5d - Refactor generation of statistics to statistics builder

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• 4822847b - Add coursebook printout for single persons

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marked this merge request as ready

assigned to @nik

mentioned in issue #354

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• 52a77a8b - Add some docstrings and types for statistics builder

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resolved all threads

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• 6978f1c5 - Fix PDF generation

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