This config option allows to display the debug toolbar at the top of the browser window instead of the default bottom position.

In the past we required this option because the old profiler displayed the toolbar at the top ... but the new profiler no longer needs it because it doesn't display the toolbar.

Although this may look as a small option, it requires some code to manage it:

• The config code to define and validate the position option in web_profiler
• The toolbarPosition argument is passed around in some profiler controllers
• The CSS styles must define special styles when the toolbar is at the top
• We even create a container parameter for this! web_profiler.debug_toolbar.position

Now that we don't need this option for ourselves, I propose to deprecate it in 3.4 and remove it in 4.0.