Escapes all values in the given list and concatenates them to a single string. This operation is required by configurations that have to represent properties with multiple values in a single line in their external configuration representation. This may require an advanced escaping in some cases.
@param values the list with all the values to be converted to a singlevalue
@param transformer a {@code ValueTransformer} for an additional encoding(must not be null)
@return the resulting escaped value
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