add convenience functions for easy access to first/last element of a list

critical: fixes uninitialized memory in tree iterator

fix copy/paste documentation

remove unused file

fix wrong flags in toolchain.mk files after updating uwproj

update uwproj

fix that iteration continued with siblings for a subtree-root - fixes #656

add explanation of depth to the iterator/visitor field

add a test case that proves that visitors are not affected by issue #656

add test case that shows issue #656

some cxListIterator() variants now also allow NULL lists

adds cx_strcpy() and cx_strcpy_a()

C23 is not a preview any longer

fix unnecessary explicit zero-terminator

fix code not compiling with GCC 15

improve cx_strreplacen() - resolves #623

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