Support animations

[lukasrad02]

As a viewer, I would like to have support for animations in SVGs in order to view SVGs correctly
Spike anlegen

[Greenscreen23]

There are currently four different, not deprecated, animation elements, that are an implementation of a subclass of SVGAnimationElement

These are:
animate, for animating properties
set, for setting properties
animateMotion, for animating the movement of an element along a certain path.
animateTransform, for applying transformations to an element.

I think it might be sensible to turn each of them into a user story, even though they are not totally separate. I think its also a good idea to look for basic properties of those elements, and ask our customer, which of those are desirable to him.