Merge branch 'f-convert-xlsx-to-json' into 'dev'

src/caosadvancedtools/table_json_conversion/convert.py

src/caosadvancedtools/table_json_conversion/fill_xlsx.py

src/caosadvancedtools/table_json_conversion/xlsx_utils.py

...le_json_conversion/data/multiple_choice_data_missing.xlsx

...son_conversion/data/multiple_refs_data_wrong_foreign.xlsx

...ests/table_json_conversion/data/simple_data_datetime.xlsx

...tests/table_json_conversion/data/simple_data_missing.xlsx

...table_json_conversion/data/simple_data_wrong_foreign.xlsx

unittests/table_json_conversion/test_fill_xlsx.py

unittests/table_json_conversion/test_read_xlsx.py