As described in http://www.cl.cam.ac.uk/~mgk25/ucs/examples/UTF-8-test.txt; Markus Kuhn <http://www.cl.cam.ac.uk/~mgk25/> - 2015-08-28 - CC BY 4.0

Apparently, using "\n" inside an alias is an error now, but "^^" basically means the same.

fix link to the documentation of the emplace function

- Implemented "copy" in terms of "add".
- Added check for JSON Pointer array indices to make sure the complete reference token was processed.
- Added test suite from https://github.com/json-patch/json-patch-tests

🔧 Fix up a few more effc++ items

The at function throws json::out_of_range.403 when a nonexistent object key is provided (just like the usual at function). This was not documented and users could assume json::out_of_range.404 would be thrown instead.

- Updated documentation.
- Added example code.

Includes CTest module/adds BUILD_TESTING option

- Adjusted table to user-defined exceptions. This was forgotten in the 3.0.0 update.
- Added update function to the table.

Fix MSVC warning C4819