Refactor quattor/schema

`quattor/schema` can't be used from the `template-library-core` repository due to the missing `monitoring/lemon/schema`. 
With the refactor,it is now possible for components to include only the component relevant types and nothing else, so we can unittest the templates shipped by e.g. the components with only dependency on this repo.

What's the improvement in the handling of monitoring schema dependency? I didn't get it.