Formatting: negative numbers in red

[andreas-mausch]

It would be great to have an option for a different formatting if a number value is negative.

Here is an example in Kotlin using odfdom:
https://github.com/andreas-mausch/haspa-camt052-to-csv/blob/00097d577ec02b09020007a1cbcdb37374ce3d18/haspa-parser.kts#L234-L257

[thscharler]

I think it should be possible. Will look into it at the weekend.

[thscharler]

I add example/negative_number_red.rs with a solution.

I'm publishing 0.16 for this, because of course there still was a bug.

[thscharler]

done