added ucx_list_free_contents()

added sstrlower / sstrupper variants

moved ucx_destructor type to ucx.h and added destructor argument to ucx_map_free_content

added convenience function ucx_map_free_contents()

optimized ucx_map_clear (noop for count == 0)

added ucx_map_clean()

improved avl function names

better and better and better AVL API

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