Disabled resizing in primaryStage.
Added methods for moving selections up and down.
Now loads images in a separate thread and stores them in an
ArrayList<BufferedImage>.
Now instructs the FileManager to load files, and instructs the
ImageCombiner to generate the gif.
Added a int delay with setter and getter, and a setImages that saves
them in an array.
Removed default gif preview image. Shows "Loading..." when loading
files.
Added a setter for images and added a private List<BufferedImage> for
storing them.
Nothing interessting.
Added a source
Reformatting for readability.
Interface implemented by Controller to be notified when FileManager or
ImageCombiner has completed their work in separate threads.