Support .ods format for spreadsheets

[goneall]

The translation utilities currently support .xls and .xlsx but does not support the ISO/IEC 26300 OpenDocument .ods format.

[goneall]

I looked into libraries for ODS - Apache POI doesn't support ODS. There are other libraries, but they have very different API's. This leads to a conclusion that this would be a very significant amount of work to support. I'll move this to "won't fix" - but if there are any contributors who would like to take this on, I can remove the label.

One library to check out which looks active: https://github.com/miachm/SODS

[bact]

Another library, ODF Toolkit (Apache-2.0)

• https://odftoolkit.org/
• https://github.com/tdf/odftoolkit/