Save Animation

[ayenpure]

Allow users to save animation for their configured view -- maybe based on temporal as well as spatial slicing?

[ayenpure]

@huiwanpnnl Please let me know what features we'd want for the "save screenshot" feature

[huiwanpnnl]

Hi @ayenpure, as mentioned in issue #34, for animation, I wonder whether we could have one "save" button next to each "play/pause", so that the user can get different animations for different dimensions.

BTW, if saving animations is complicated to implement, I would find it acceptable (and already very useful) if clicking a "save" button would result in a series of screenshots being saved to, say, a folder, so that the user can subsequently use a different software (e.g., ImageMagick) to create an animation.