json_error_max → JSON_ERROR_MAX

[DimitriPapadopoulos]

I would like to change json_error_max to uppercase, this is common C usage.

Is it considered to be part of the API? If not, it could be moved to json.c, otherwise we could keep both.

[DimitriPapadopoulos]

Thinking about it, it has to be part of the API, for the end user to be able to provision a large enough error_buf.

[LB--]

Yes, I added it in 2013 in 09896ab for specifically that reason. I probably should have made it all caps, but back during 2013 there was no precedent for that in the codebase, and json_value_none was lowercase, so I matched that. It can certainly be changed to better clarify its constant nature.