[GREENFOOT-360] Scaling image doesn't update actor size/bounds

When an actor's image is scaled, the actor size (for collision checking purposes) is not recalculated.

(This is perhaps an API design flaw rather than a behavioural bug \- i.e. maybe it shouldn't be possible to scale an image "in place"; rather, scaling should return a new image).

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Issue metadata

• Issue type: Bug
• Priority: Low