[ChangeLog][QtCore][QTimerEvent] Added constructor taking a Qt::TimerId.
Also added a getter for Qt::TimerId.
[ChangeLog][Potentially Source-Incompatible Changes] The protected
(and undocumented) QTimerEvent::id member variable has been renamed to
m_id to allow for the addition of an id() getter that returns a
Qt::TimerId.
Task-number: QTBUG-128144
Change-Id: Ia156f11e9e9347b6bf61b36e40da3ad551d23407
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 29b98eabf07b9e9d223039ec58b989acbaba844c)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>