add szmul.c to msvc project

fix wrong "variant" of zero/NULL/false

add explicit casts to silence warnings

fix compilation for compilers which don't set __WORDSIZE

add check for C23 compatibility

add sys/types.h to the common includes to fix a problem with ssize_t

increase test coverage

fix number parser not detecting integers out of range

add cxJsonReset() and cxPropertiesReset()

add documentation - resolves #431

and changelog entry for issue #523

add fake doc to mute doxygen complaints

minor cleanup

json: enable multiple subsequent fills - relates to #431

(0) -1000 -300 -100 -14 +14 tip

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