feat: add window as third param to update

[TimUntersberger]

This PR tries to tackle a common problem where you want to modify the window at runtime.

My proposed solution is to add a third param to the update function of an application which is the "Window" of each platform.

• winit => winit::window::Window
• glutin => glutin::window::Window
• web => ()

I also add an example under examples/use_window which shows how you could resize/move the application at runtime.

One problem which I haven't fixed yet is that when resizing the window using winit for example the application only rerenders after some time and moving the window before this rerender happens causes a Next Frame: Outdated from the Compositor.

I don't really know how to fix this, because I am not too familiar with the codebase, so I would like some guidance on this.

If we would have to manually recreate the swap chain after resizing the window for instant rerendering I'd suggest we should create a wrapper Window struct which does this automatically and just delegates too platform-specific Window implementations.

Closes #767, Closes #644, Closes #493