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921b9711eautil: introduce and use `ARRAY_SIZE` macro (Sebastian Falbesoner) Pull request description: This PR is another tiny improvement found while working on #1765, with the goal to avoid code repetition. The `ARRAY_SIZE` macro definition is pretty wide-spread in C projects and e.g. matches the one [used in the Linux Kernel](9702969978/include/linux/array_size.h (L11)) (without the additional check to reject pointers, as we would need GNU C for that, see e.g. https://stackoverflow.com/a/19455169; not sure if a useful counterpart exists that only relies on C89). Replacement instances were identified via `$ git grep sizeof.*/.*sizeof`. ACKs for top commit: w0xlt: ACK921b9711eareal-or-random: utACK921b9711eaTree-SHA512: 44b6bf0132cf00fade526a3fc04e03dc896d04874123614c032206b61f97c81f94d139b6cc0c108eceaa699251580c19420d230b3150607303ca2cb7ab9a0bcb