feat: Update ngx-vcard.formatter.ts

[iamandersonp]

add code to enforce ANSI compatibility to work correctly with outlook

[DanielHabenicht]

Thanks for the PR, but which characters are misrepresented in Outlook?
This seems more like a bad input data issue than a problem of the formatter.

[iamandersonp]

The proble is that outlook doesnt read special characters like á é í ó ú if the file is saved in utf-8, the only way they display correctly is if the file is saved in ANSI, this PR do that, and it doesnt afect others imports, like import it in iphone, android devices or even in contacts in mac, the only afecteds are outlook and windoes contacts

[DanielHabenicht]

I think we might have to make this optional and add-in, as it not adhering to the RFC: https://datatracker.ietf.org/doc/html/rfc6350#section-3.1
Also we probably should reuse the encodingPrefix option to add an option for this encoding.

One other thing you might try is set the encoding option in outlook or in the vcard (via encodingPrefix option)
See: https://stackoverflow.com/questions/8617439/utf8-encoding-with-vcards-in-windows

[iamandersonp]

I think we might have to make this optional and add-in, as it not adhering to the RFC: https://datatracker.ietf.org/doc/html/rfc6350#section-3.1 Also we probably should reuse the encodingPrefix option to add an option for this encoding.

One other thing you might try is set the encoding option in outlook or in the vcard (via encodingPrefix option) See: https://stackoverflow.com/questions/8617439/utf8-encoding-with-vcards-in-windows

None of that works the only solution is re-encoding all the vcard to ansi in wich case afther generating the vCard string you have to use the code i added to do it (I have to generate the vCard string and afther re encode all to ansi to generate the downloadable file and in that process i cannot use the directive from this package)