AnnotationUtils.getElementValueArray handling of defaults

[wmdietl]

AnnotationUtils.getElementValueArray with an element name is deprecated.
It allowed using the default value, by providing a boolean parameter.

The suggested replacement with an executable element does not provide the same mechanism.
The only option is to provide a default value, which duplicates the logic from the qualifier declaration.

For examples, see the usages in
vehiloco/linear-checker#16
which should be cleared up when this issue is fixed.