string_util_vale_list()

Created function string_util_value_list() which will parse string like "1,2,3,7-10,1-5" and return a int_vector_type instance with the values:

    {1,2,3,7,8,9,10,1,2,3,4,5}

Complements existing functions string_util_active_list() and string_util_active_mask().