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

add empty sections to features.md

remove deprecated align=center attribute

remove trees from UCX 3.0

fix some typos in UCX 2.1 documentation

update general web documentation structure

add header and footer to list of build dependencies

add missing docs for cxEmptyMap

fix wrong docs for cx_stream_copy()

add missing docs for cx_invoke_destructor()

update Doxyfile to Doxygen 1.9.6

fix const-ness of non-mutating iterator creation for maps

simplify map class structure

fix inconsistent destructor requirements for list and map classes

fix rehash not valid for non-hash-maps

add empty map implementation - fixes #259

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