Support of jsonc

[NehCoy]

Hi!

Microsoft defines a JSON-Format which support comments. The default file extension is jsonc ("c" for comment). It would be nice if cJSON would also support "JSON with comments" (*.jsonc).

Thanks.

[mbratch]

It probably would be very easy to create a pre-processing function to strip out the comments of a jsonc string buffer and return the json without comments.

[Eventide]

#738