Add more Doxygen comments to most of the project

requested review from @david.hermann

assigned to @frederik-alexander.keens

added 145 commits

• 213070cf...46525370 - 142 commits from branch main
• 28dab00b - Merge remote-tracking branch 'origin/main' into doxygen-cleanup
• dbafae78 - Add doxygen comments to new menus
• a2e43865 - Delete accidental double declaration from merge

Compare with previous version

closed