Merge branch 'f-table-json-data-schema' into f-convert-xlsx-to-json

src/caosadvancedtools/table_json_conversion/fill_xlsx.py

src/caosadvancedtools/table_json_conversion/xlsx_utils.py

src/doc/table-json-conversion/specs.md

unittests/table_json_conversion/data/error_simple_data.json

unittests/table_json_conversion/data/indirect_data.json

...ests/table_json_conversion/data/multiple_choice_data.json

unittests/table_json_conversion/data/multiple_refs_data.json

unittests/table_json_conversion/data/simple_data.json

...s/table_json_conversion/data/simple_data_ascii_chars.json

unittests/table_json_conversion/data/simple_data_schema.json

unittests/table_json_conversion/test_fill_xlsx.py