fixes memory leak in test_ucx_buffer_eof

adds web documentation to project

updates documenting comments

documents UCX_STREAM_COPY_BUFSIZE

fixes ucx_sprintf macro and adds tests for sprintf and bprintf

changes ucx_stream_Xcopy API

removes superfluous UCX_VERSION macro

fixes UCX_FOREACH documentation

fixed misaligned memory access in test_ucx_buffer_write

fixed further usages of SIZE_MAX

removed dependency to stdint.h in stack header

added casts for mallocs in AVL implementation (to satisfy c++ compiler)

removed some implementation details from documentation + fixed ucx_buffer_write doc

added sstrstr() function + improved sstrsplit variants by using sstrprefix()

added important test case to sstrsplit and fixed bug with consecutively occurring delimiters + fixed build system not linking test binary with newest library build

(0) -100 -15 +15 +100 +300 tip

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