There were still crashes where a Timer was called on an invalidated
object. Now, this timer is in Atomic and therefore gets destroyed with
the widget.
This way we can have multiple stylings running and it is more logical,
cleaner, and more general purpose.

For the styling timer we can not use the static version of singleShot,
because we must be able to stop it (when switching XMLs while something
is being highlighted).
Also, an INIParser object has been leaking

And minor cleanup

Like finding the parent of a dynamic child panel, counting dynamic child
panels, ...

This way, new higher numbers get put in the back.

... instead of unsorted at the end.

When opening context help the topic can now be anywhere on the page.
Also: QTabWidget::clear() clears the tabs but does not delete
anything... oops. Now we do this manually potentially saving big amounts
of memory and lookups.

Now it works multiple times!

Some further restructuring

This is an intermediate commit.

We need to be able to set the tab bar everything gets built into... so
first, split up some functionality.