[IMP] website: allow better animations thanks to requestAnimationFrame

This commit extends the behavior of the Animation class of the
"web_editor.snippets.animation" module.

Now, all animations can easily define an animation algo update without
much caring about performances. All that must be done is:

* If the "start"/"stop" method is/are defined, do not forget to call
the _super parent method (which will now initializes the animation
components).

* Define particulary-named method in your Animation class extension.
See in-code comment of the _prepareComponents method.

This extension should be used to define all animations. For example the
use of $(window).scroll(function () { /* do stuff */ }) is now the same
as defining the function with on_scroll: function () { /* do stuff */ }
except that the later one will be more efficient, smoother and allow
you to not care about throttling / event binding/unbinding / ...

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