Remove empty file
[doc_comment addon] Add support for @self annotations
[doc_comment addon] Add support for @typedef

Will only see typedefs from files loaded previously (and current file)

Does not store them in condensed output yet.
[doc_comment plugin] Support non-ascii identifiers
Overhaul type and property purging approach

The new approach is simpler, faster, and better at dealing with
non-variable properties.

I am not entirely convinced that there won't be regressions.