add tests for creating iterators with NULL lists or maps

the elem_count member of an iterator was not updated after removing an element flagged by cxIteratorFlagRemoval() - fixes #728

kv-list: implement mutating iterator support

add changelog entry

implement non-mutating iterator

allow setting the key again on the same node

disallow setting a key that already exists

consider the edge case that either list or map operation fails when adding an element

increase test coverage for kv-list

improve cx_kv_list_insert() by using low level access to the list method

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mercurial