following https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#Rh-override
virtual means exactly and only "this is a new virtual function."
override means exactly and only "this is a non-final overrider."
final means exactly and only "this is a final overrider."
Nothing was changed from e.g. override to final, just reduced duplication of
these labels.
The qTox Project is not associated with the Tox Project in any way, with the
exception of "qTox" using the Tox Projet's "toxcore" collection of libraries.
In particular, the Tox Projet does not own copyright over the qTox Project's
"qTox" collection of software, source code, and assets.
The qTox Project's assets are under the sole copyright of the qTox
contributors, and no partiular rights are granted to the Tox Project.
