Correctly handle use statements

lib/private/app/codechecker.php

lib/private/app/codecheckvisitor.php

tests/data/app/code-checker/test-deprecated-use-alias.php

...s/data/app/code-checker/test-deprecated-use-sub-alias.php

tests/data/app/code-checker/test-deprecated-use-sub.php

tests/data/app/code-checker/test-deprecated-use.php

tests/data/app/code-checker/test-use.php

tests/lib/app/codechecker.php

tests/lib/app/deprecationcodechecker.php