fix accidental additions of unnecessary unistd.h includes

fix overlooked renaming of cx_attr_export to CX_EXPORT

add cxListEmplaceArray() and cxListEmplaceArrayAt() as preparation for the clone implementation

add possibility to wrap valid function of an iterator (just for the sake of completeness)

define the function pointer for clone functions

minor wording improvements in buffer documentation

remove the concept of "mutating iterators" - resolves #579

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