QWidget: copy Q{Menu,ToolBar}::addActions() functions

Since any QWidget can have actions since at least Qt 5.0, it makes no
sense to keep the addActions(text) etc. convenience functions that
have traditionally existed in QMenu and QToolBar only in these two
classes, where, to add insult to injury, they were just copies of each
other, increasing library size for no real reason.

So, add them to QWidget, too. This will allow us to de-duplicate the
code between QMenu and QToolBar, too, which will be done in a
follow-up patch, subject to BC constraints.

[ChangeLog][QtWidgets][QWidget] Added the same addAction(text)
overloads that previously existed only on QMenu and QToolBar, with the
following two differences: First, the QKeySequence object, if any, is
now available on all overloads, not just the ones taking a slot, but
has changed position to allow, secondly, passing an optional
Qt::ConnectionType parameter which will be passed to the
QObject::connect() call. In addition, the function template overloads
are now properly constrained so that they exist if and only if the
corresponding QObject::connect() call does, too.

Change-Id: Ifc3c2789600cf603192de8224fecbf9c88d91970
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

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