Support using any inspector pair for reading/writing config files

[dominiklohmann]

Currently, the config file format is a custom format that only CAF uses.

I think it'd make a lot of sense to just support arbitrary inspectors for reading the file. For example, with the included JSON inspectors this would make supporting a JSON configuration file trivial. Similarly, users could easily add YAML or TOML inspectors to support other more common config file formats.

[Neverlord]

I like the idea. Just one remark:

(...) would make supporting a JSON configuration file trivial

The default config reader already accepts JSON. 🙂