remove dynamic arrays which are not supported by msvc

fix missing pointer initializations

add cast from size_t to unsigned to avoid warnings from certain compilers

fix compile regression on some platforms after removing sys/types.h include

fix cx_mempool_free crash if ptr is null

avoid state buffer allocation for JSON with reasonable nesting depth

add cx_nmemb() utility

make both gcc and clang happy with how cx_json_value_nothing is initialized

(0) -300 -100 -30 -10 -8 +8 +10 +30 +100 tip

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