update CHANGELOG, COPYING, and README v3.0

Release Version 3.0

add release date for UCX 3.0

Added tag v3.0 for changeset b4bd0155f03f

improve the CSV example

some fixes in example code

merge upstream changes

fix typo in mempool.h

change cxMempoolDestroy doc

more doc fixes

fix iterator doc

fix typo in list.h

fix typos in hash_map.h

add overridable macros to the install docs

make streamcopy buffer sizes overridable

unify the list swap SBO sizes

slightly improve CSS

add iterator documentation

add map documentation

add documentation for the lists

add documentation for collection.h

add mempool example

improve how GTest config is passed during builds

improve mempool implementation

add a low-level stdlib-based cx_reallocate()

add docs for the compare.h and printf.h utilities

add web docs for buffer and stream copy

add web documentation for strings

add allocator example

update install instructions for ucx 3.0

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