[GREENFOOT-174] Built in animated actors
At the moment a seperate helper class is needed to make actors with an animated image, as well as a lot of seperate files. It'd be nice if this could be incorporated into the actor class more neatly using a gif \- so for instance the path to an animated gif file could be passed into the constructor, and this could automatically become the animated actor image.
- Issue type: Task
- Priority: Medium
- Fix versions: 2.0