* One or more preview windows can be launched and used with the GDevelop Debugger, like on the desktop app.
* To run the Debugger, click on the button next to the Play button in the toolbar and choose "Start Preview with Debugger and Performance Profiler"
* This is useful to inspect instances of objects, inspect internal messages or run the performance profiler.
* A right click on the Play button will also allow to launch a new preview, in a new window.
* Also fix the loading screen not shown in the preview on the web-app even when asked to be shown (using the game properties preview button)