Rework default names

[Arkadii Hlushchevskyi]

Currently default titles and obscurities are being stored within NNDData.
This leads to the need for cumbersome checks and storing extra data in cosave when it's not needed there.

To mitigate this NNDData::UpdateDisplayName() and NNDData::GetName() should be updated to receive an Actor and be able to substitute GetFullName() for title when needed.

This would also remove the need to store UpdateMask::kObscurity since it will never be persisted in a cosave.

To extend this even further we can remove the need for UpdateMask::kDisplayName, by not saving displayName either.
It will be reconstructed anyway, so why bother.