Change/force the document encoding during conversion (UTF-8)

[dagwieers]

This functionality already exists for certain import/export filters. Since this heavily depends on the filter and filter options, we cannot generalize this for all the document formats. Also, conversion of encoding only works if you know exactly what you are importing, and that's not something we can detect easily.

If you need more information on how to influence import and export filters using the -i / --import and -e / --export options, look at the man page and the information from: https://github.com/dagwieers/unoconv/blob/master/docs/filters.txt