review CatchVariableReferenceFunction, CatchVariableScopeFunction #1145
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This PR contains CatchVariableReferenceFunction, CatchVariableScopeFunction.
The main purpose is CatchVariableReferenceFunction, which returns all the references to the catch variable. The second on is helper classes which might be useful for others so it is public.
It depends on PR CtQuery#filterChildren(null) #1140
The tests will be added later, because they share a lot with tests of #1136