Adding missing postfixes for QuantityKind Enums#99

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ligno777 wants to merge 1 commit intobuildingSMART:mainfrom

Commits on Dec 18, 2025

Though quantityKind "Area" is used in IFC 5, it's lacking its respective postfix - only quantityKind "Length" and "Volume" have been defined this way so far.
ligno777
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