core-invoice 2.0.0

EN 16931 + Peppol PINT semantic model (VAT, GST, SST, consumption tax)
Documentation 
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/// Syntax root. Not derived from BT-3. Self-billing is a profile + type code, not a third kind.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default)]
pub enum DocumentKind {
    #[default]
    Invoice,
    CreditNote,
}