Fix calculator name normalization

[francescolaffi]

fix #54 (and some other edge cases)

For what I was able to understand from official source, and verify with very limited real cases, only a specific subset of characters with accents or diacritics are transliterated.

eg: Ž is considered as Z, but ñ is not whitelested so is ignored

Refs:

• https://www.agenziaentrate.gov.it/portale/documents/20143/299856/Circolare+34+del+20+07+2011_circolare+34e.pdf/
• https://dait.interno.gov.it/documenti/circolare-n-1-2008-0.pdf

[DavidePastore]

Hi @francescolaffi. Thanks for this PR! Unfortunately it seems that the PHP 7.2 build is broken. Could you take a look at it? Thanks!

[francescolaffi]

Looks like I stumbled in some behaviour change between php 7.2 and 7.3 for casing of the sharp s. all other chars are handled consistently: https://3v4l.org/p9WAL

handled both the lower and upper sharp s to the char array as php < 7.3 consider them different characters and not differnt casing of the same character

[francescolaffi]

@DavidePastore hi Davide, if you could trigger the workflow meanwhile we can see if its green on all php versions, thanks!

[DavidePastore]

Thanks for your effort on this PR, @francescolaffi. 😄