Add feature ignore unknown AIs

[RafaRuiz]

Hapened to have a code such as:

��0108055277900104�17260201�1024CA167�AIC030794010

Specially the part of:

AIC030794010

AIC is actually the number 716, which is an Italian reimbursement number. Also this isn't included in the library but can be easily added in a custom parser.

The problem isn't the AIC <-> 716, but that I might want to ignore unknown AIs.

Sometimes these codes bring fancy codes or information at the end of the string that we don't care about.

So I:

• Added a feature to ignore unknown AIs.
• It has backwards compatibility, because the default ignoreUnknownAIs is false
• It also does the same job if the unknown AI is in the middle. It'll look until the next GS1BarcodeParserConfig.groupSeparator