Add JSON schema for Markdown -> CLIP converter to easily add new placeholder types and load them from YAML config

[EmilyGraceSeville7cf]

I think such feature requires a reliable not sed-based or bash-based parser. I think it will be implemented as a part of Go-based parser later.

[EmilyGraceSeville7cf]

Hmmm... After code refactoring I see it's possible to implement here. In a simplified way but possible. 😄