Until the UI frameworks make it possible to get the size or scale for
the window, this would cause the window contents to be scaled
incorrectly if the host does not set a scale factor.
With some additional VIZIA patches. This currently causes the layout to
do weird things, so it's not usable yet. On the baseview side this has
also only been implemented for Linux. Once the vizia quirks are gone we
can add a widget that you can add to your GUI to make it scaleable.
This removes the need to pass a lot of these `ParamSetter`s and
`GuiContext`s around. We also don't need explicit events to reset a
parameter anymore since you can get this information from the parameter
itself.
