- Implement the "TopDUContext::SimplifiedDeclarationsAndContexts" feature-level in the C++ language support, which allows a simplified processing-level similar to ctags
- Implement the "TopDUContext::Empty" feature-level which only produces top-context meta-information from the preprocessor (import-structure, macros, etc.)
- Recursively check whether the required feature-set of child-contexts is satisfied when updating