[Development] QT_REMOVED_SINCE HOWTO

[Marc Mutz]

https://wiki.qt.io/Things_To_Look_Out_For_In_Reviews#Specifically_QT_%2A_REMOVED_SINCE_%2F_QT_%2A_INLINE_SINCE

-- 
Marc Mutz <marc.mutz at qt.io>
Principal Software Engineer

The Qt Company
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www.qt.io

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