Remove or deprecate AbstractTypeBuilder::openAbstractType() and Declaration::setAbstractType()
The following discussion from !424 (merged) should be addressed:
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@igorkushnir started a discussion: (+2 comments) openAbstractType
is used only in kdev-php and umbrello's bundled copy of it. If we don't remove it outright and adjust the uses, maybe at least deprecateopenAbstractType
? The compiler warning will hopefully get rid of these usages and let us removeopenAbstractType
without hassle eventually.