embedding: implement cef_string_utf16_cmp()
embedding: begin cef string_list api

cef_string_list_alloc()
embedding: cef_string_list_size()
embedding: cef_string_list_append()
embedding: cef_string_list_value()
embedding: cef_string_list_clear()
embedding: cef_string_list_free()
embedding: cef_string_list_copy()