Introduce functionality to write JSON-configurations from ConfigObjects

[swanitzek]

Currently the library provides read-only access to JSON configuration-files.

I would be lucky to see the ability to save single ConfigObjects as JSON-files again to persist configuration changes made by the application.

[Dynalon]

I'd love that, too. Would require to write a custom JSON parser as we don't actually use pure Json (comments should be preserved when changing config values).

[ravensorb]

What about using Json.Net -- I believe it maintains comments as long as you use JObject