m.dox: properly test also links to typedefs, enums and enum values.

m.dox: properly test also links to typedefs, enums and enum values.

Instea of updating the Corrade tagfile, which would be several megabytes
of useless data, I'm now cherry-picking just what's changed.

Will make updates slightly harder but not impossible (can't just replace
the whole file but have to cherry-pick again). OTOH I can now use the
same approach for STL-tagfile-specific workarounds instead of bundling
another 2 MB of XML data.