GitLab

Refactors tests & move parser functionality out of KafkaTopology.kt.

Numbers for stored as doubles and transformed into strings.

If a cell is numeric the string
value cannot be retrieved directly.

Merge branch 'master' of gitlab.switch.ch:memoriav/memobase-2020/services/import-process/table-data-transform

- Sheet index is now offset to one based.
- Filters empty rows.
- Improves error message for identifier errors.
- Properly transform cell values.

Will now continue working on the rows and
simply report the invalid identifiers per row.

getCell is zero based.

This way the mapper does not have to check if a
field has any content to copy.

Load external library for most things and fixes some errors.