add cxTreeSize() - resolves #624 default tip

add test and documentation for cxListContains() - fixes #643

adds cxListContains() implementation (still needs test and docu)

add windows support for new buffer auto-extend strategy - relates to #641

new auto-extend strategy for CxBuffer - resolves #641

adds cxBufferShrink() - resolves #626

fixes missing cx_attr_export - relates to #642

fixes errno value after failing cxBufferSeek() to be consistently EINVAL

adds cxListSet() - resolves #642

fixes that cx_tree_search() did not investigate subtrees with equally good distance

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