Just a quick update this week.
I'm still waiting for someone to have a look at PRs #2535 and #2499. Hopefully they can get it soon.
I have quite a bit of work done locally but I'm not in a hurry to open another PR. My plan is to open a PR around the weekend with 10 more high-priority files with added/edited doxygen comments. The files in question will be the ones from stream.h up to metaengine.h from this list.
I am still investing a significant chunk of my time into developing the knowledge of aspects of C++ used in ScummVM headers. Figuring out how streams work was the latest challenge :)