ScalaPsiUtil.parameterOf fixed: check for equivalence is not enough
unused ProblemDescriptor parameter is removed from AbstractFix.doApplyFix()
AbstractFixOnPsiElement to use smart pointers instead of psi elements
AbstractFix inheritors are refactored to use AbstractFixOnPsiElement
AbstractFix marked as deprecated
Quickfixes should not store psi elements: refactored with AbstractFixOnPsiElement