Removing dependency on iconv

[CharlesOkwuagwu]

Hi @AlexKovalevych

Would you be interested in removing the dependency on the iconv library, it's a pain to get it to build on windows, and besides it seems you only really need it for UTF-16LE to UTF-8 conversion, which can be handled directly by the built-in :unicode module.

I can send a PR to that effect.

Regards.

[AlexKovalevych]

It would be nice to remove that dependency, but its used not only for UTF-16LE to UTF-8 conversion, e.g. https://github.com/AlexKovalevych/exoffice/blob/master/lib/exoffice/parser/excel_2003/string.ex#L72

Despite that, you can make a PR and we can test it with different cases to make sure algorithm will still work.

[CharlesOkwuagwu]

I have a fork of this here: https://github.com/CharlesOkwuagwu/exoffice

[CharlesOkwuagwu]

Have you looked at this yet?

[rockneurotiko]

Maybe iconv can be changed for this one that is written in pure elixir:

https://github.com/tallakt/codepagex