Use YAML for config files

[maximilize]

YAML has some advantages over JSON, for example the use of pointers could make the configuration files slimmer. This is just an idea, and I suggest to consider this option in a later release.

[pavjacko]

@maximilize sound interesting. there is also idea to use config.js style configuration similar to webpack. definitely something to discuss for the future. for now I opted deliberately for json to keep structure constrained until overall architecture and system gets standardised . that means quite few iterations and potential required backward migrations. json makes this easy for now

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