json_object_get_int/int64/uint64() now sets errno to ERANGE when the source value
can't be represented in the target type.

Json objects of type double with the value NaN could cause undefined
behavior when casting double to int in `json_object_get_int`.

The behavior of the json_object_array_put_idx() is that, if a user wants to
insert an element inside a JSON array, the element will be replaced.

For some cases, a user would want to insert an element into the JSON array
and shift the elements to the right.

For indexes that are outside the length of the current array this behaves
like json_object_array_put_idx().
If a user wants to enforce that the JSON array is not expanded, then the
json_object_array_length() function can be used to guard against that.

The main driver for this change is JSON patch, where the 'add' operation in
an array means inserting a value at a certain index and shifting everything
by one.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

This option enable color in json_object_to_json_string_ext.
I've try to made something similar to jq output,
but I've color true/false and null in purple,
as it's what is common color scheme used in programing language in emacs.

also add a '-c' option into json_parser to test it.

note: that I could have done a color() function similar to
what is done with indent(), but as the code is pretty small
I've keep it as it. so if you want  me to use a subfunction
tell me and I'll do it.

Signed-off-by: Matthias Gatto <matthias.gatto@protonmail.com>

Most of these sites support HTTPS (some forward to HTTPS when accessing
the HTTP versions). Use HTTPS directly if supported.

Some URLs led to 404 error pages. Adjusted the links to point to
new locations.

I did not adjust the Microsoft HTML Help Workshop link because it seems
that this software is not available anymore. Instead of removing the
link entirely I kept it there in case it helps someone to find the
software on archived websites.

Update the docs to mark all members of those structures deprecated, and
 suggest what to use instead.

This change introduces JSON_C_OBJECT_ADD_CONSTANT_KEY
as a replacement of JSON_C_OBJECT_KEY_IS_CONSTANT.

The description of json_object_object_add_ex tells to
look at the flags JSON_C_OBJECT_ADD_* but it is not
for JSON_C_OBJECT_KEY_IS_CONSTANT.

From the point of vue of a developper using json-c,
the function json_object_object_add_ex is mainly used,
not the hash facility, it seems more natural to provide
a regular naming of prefix JSON_C_OBJECT_ADD_CONSTANT_KEY.

Prevent an undef warning regarding __STDC_VERSION__ by checking whether it is defined before checking its value.

See also issue #658.

Also add the json_object_new_array_ext, array_list_new2, and array_list_shrink functions.

Keeping this would be inconsistent with the other documentation

I also added a couple trivial, but related, suggestions.

closes #460

Fix json_object_object_foreach to avoid uninitialized variable warnings
using ANSI C or MSC.

In VS 2015, the warning text is "warning C4550: expression evaluates to a function which is missing an argument list".