Refactored VCardFormatError into subclasses

[Zearin]

• VCardFormatError renamed to VCardError
• Error Subclasses for Names, Values, and ItemCount

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Dunno what you’ll think of this one, @l0b0, but I thought some error types which describe more specific types of VCard errors would be helpful for the end-user.

The classes VCardNameError and VCardValueError are a nice parallel to the standard library exceptions NameError and ValueError (although they only inherit from VCardError).

The class VCardItemCountError is vaguely like the standard library IndexError, in that both are raised when an expected number of something is out of bounds.

Finally, there’s the VCardLineError class, whose name makes it pretty obvious what went wrong. :)

[Zearin]

@l0b0 Hi

[Zearin]

Thanks, @l0b0!