add test for reading multiple json values

fix missing value_ready reset when returning a CxJsonValue

adds test case for numbers - currently fails due to issue #482

fix copy-pasted parameter name

add UCX string support to cxJsonFill()

add support for UCX strings in cxPropertiesFill()

rename utils.h to streams.h

move szmul to common.h

simplify parsing of numbers

add assertion that triggers when cx_array_copy() stops working for NULL arrays

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

(0) -300 -100 -16 tip

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