Improve layout of state views

The layout of state views is quite broken and several things need to be fixed:

When a new state is created it is always located at the bottom and moving it expands the container. The state will always stay at the bottom, though.
more than one self-transition on a state is not drawn properly, they overlap
when there are transitions from A to B and from B to A the transitions overlap
when layouting, saving, closing the aspect and reloading it, the layout is not exactly the same anymore (the states are placed lower than before, for instance)
many transitions from one and to one state will lead to overlaping transitions or labels

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