A macro named `ENABLE_LOCALES` was added and an option with the same name too in the CMakeLists.txt

Fix error pointer behaviour of cJSON_ParseWithOpts()

pointer in error case and change code to match new expectations.

make test tried to execute the test for cJSON_Utils, which has been
ported to CUnity tests.

If realloc returns NULL, ensure didn't abort but returned
printbuffer.offset instead. If an attacker can control
printbuffer.offset and also make realloc fail at just the right moment,
this would make cJSON potentially write at an arbitrary memory address.

Fix typos in json.dict

Null pointer fixes

Also fixes a potential memory leak