Include JSON formatting tool binary in release.

[damien]

Summary

SUMMARY: Infrastructure "Bundle JSON formatting tool with distribution"

Purpose of change

At present, the only way to use the JSON formatting tool is either via the website mentioned in doc/JSON_STYLE.md or by compiling the tool via make json_formatter.

I'd like to be able to run this tool outside the context of a browser or the C:DDA repo to do things like:

1. Run the formatter as part of an editor integration
2. Run the formatter within a CI step or Github action outside of the C:DDA repo
3. Run the formatter bundled with an arbitrary version of C:DDA to determine if some JSON is compatible with that version (useful for doing things like git-bisect to figure out what version compat for a mod breaks)

Describe the solution

Add the JSON formatting tool binary to the list of files included in the release.

Describe alternatives you've considered

1. Compiling the tool in another project. Seems like a waste of effort as each build compiles the formatter that's guaranteed to work for that exact version of C:DDA.
2. Finding a different way to validate JSON. Likely a huge duplication of effort that isn't really required.
3. Calling the XHR endpoint on http://dev.narc.ro/cataclysm/format.html . Aside from being a bit rude to do this without asking, I'd rather not decouple builds or scripts to something over a network.

Testing

This PR should be good if the build completes and the release includes the compiled binary in tools/format/json_formatter.(exe|cgi)

Additional context

First of a number of miscellaneous changes I'm hoping to make to make a nicer out-of-the-box contribution experience.