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

(0) -300 -100 -10 +10 tip

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