vCard parser for vCard 3.0. See RFC 2426 for more detail.
This parser allows vCard format which is not allowed in the RFC, since
we have seen several vCard 3.0 files which don't comply with it.
e.g. vCard 3.0 does not allow "CHARSET" attribute, but some actual files
have it and they uses non UTF-8 charsets. UTF-8 is recommended in RFC 2426,
but it is not a must. We silently allow "CHARSET".
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