qt: add possibility to disable picture-in-picture (pip) mode

This setting allows disabling picture-in-picture mode.

Request review @chub.

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changed milestone to %4.0

added 32 commits

• e1255914...c9acd8a0 - 31 commits from branch videolan:master
• 80868bba - qt: introduce setting `qt-pip-mode`

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added Component::Interface: Qt label

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merged