These functions were refactored recently, e.g. see e300d44e69. In some cases
it's less clear now which functions are getters and which are setters. Case in
point, I first thought `layout.use_property_split()` would enable property
split (that's what the name suggests). Previous names like
`uiLayoutGetPropDecorate()` and `uiLayoutSetPropDecorate()` were more clear.
By using the `[[nodiscard]]` attribute for getters, the compiler will emit
warnings when using such functions like a setter, without using the returned
value.
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