Qt::Modifier: do some cleanups

Qt::UNICODE_ACCEL had no effect since at least Qt 4.0. We can drop
it in Qt 6. The whole Qt::Modifier enumeration is still widely
used, so we can't drop it yet, but we should aim at doing so in
Qt 7. Add a note.

[ChangeLog][QtCore][Qt::Modifier] The Qt::UNICODE_ACCEL enumerator
has been removed. It had no effect since Qt 4.0.
[ChangeLog][QtCore][Qt::Modifier] Usage of the enumerators in
the Qt::Modifier enumeration is discouraged. The enumeration
will likely get removed in the next major version of Qt.

Change-Id: If25f30d920878d32903b91a38044f5da042c7eab
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

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