#179 improve API for list content destruction

add doc for cx_for_n

simplify destructor signature (but loads more responsibility onto the user)

simplify auto-free contents in lists

remove list destructor

configure clang-tidy to ignore cert-err58-cpp for test code

add [[maybe_unused]] attributed to params of mocked function

add test for cxListCompare

fix memory leak in test data

make cxListMemoryMgmt a linkable symbol

improve testing allocator + add tests for it

migrate list tests to gtest

fix required cast if compiled with C++

migrate tree tests to gtest

test uncovered branch in cxReallocate()

do not use macro for suite name

(0) -300 -100 -16 +16 +100 +300 tip

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