minor wording improvements in buffer documentation

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

add support for non-sorted lists in cxListInsertUnique() and cxListInsertUniqueArray()

make cxCollectionSorted() always return true for empty collections regardless of the sorted flag

clean up header files and adds support for comparing arbitrary strings with string.h functions

remove unnecessary members from the array reallocator struct - fixes #621

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