copy list items when they are added to the list

changes off_t to ptrdiff_t

adds missing assignments for new list node

adds first draft for linked list implementation

removes unnecessary cx_allocator typedef

make cx_allocator_class shared

fixes missing CUnit include dir

high level allocator functions should be real functions, not macros

no C99 comments

add at least a cxFree() call, even if we can't test it

adds allocator interface and default implementation

starts ucx 3.0 development

Added tag v2.1 for changeset 871a8ffe6c9d

merges closed feature/array branch v2.1

closes array branch towards ucx 2.1 release feature/array

adds changelog to html documentation

fix: missing test header files in make dist target

fixes build on FreeBSD and macOS

fixes string replace function in case replmax is 0

adds more sstrreplace tests

adds CHANGELOG

fixes another leak in string replace function

fix: index buffer in string replace was not freed

adds string replace functions

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