qt: initialize timecode structure and do not use `#if QT_HAS_LIBATOMIC`

• It is possible that PlayerController::highResolutionTime() is called before the timecode is updated.
• If QT_HAS_LIBATOMIC is not defined, using #if QT_HAS_LIBATOMIC may emit a warning. This was first reported by @robUx4.

Request review @chub.

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changed milestone to %4.0

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added 33 commits

• 60afea52...09d3f991 - 31 commits from branch videolan:master
• e3f7767e - qt: initialize `m_highResolutionTime` in `PlayerControllerPrivate`
• 7d2000b2 - qt: use `#ifdef` for `QT_HAS_LIBATOMIC` in `PlayerControllerPrivate`

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enabled an automatic merge when all merge checks for 7d2000b2 pass

merged