Spike: Identify chapters of qml language spec

Creating a language specification requires a clear structure.

The aim of this research task is to identify the high level chapters we want to be covered in the specs, not necessarily the content in itself.

After this spike, we want to have a clear grouping of chapter which are required for a first draft and which parts are left out of the specification. Current understanding is to have dedicated chapters for each aspect (semantics, syntax,...).

Note that this is not about the default item collection, but about the language specification in itself.