simplify parsing of array and object elements

treat integers and doubles both as JSON numbers

remove single-member structs

fix test function names not in line with naming convention

add reallocarray() like functions - resolves #468

remove cx_for_n() macro - fixes #467

increase list test coverage - fixes #454

test coverage does not really work with clang

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

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