Animate arrow indicators

[Naviary2]

The arrows on the edges of the screen pointing to pieces off screen are not animated. When you rewind and forward moves the arrows instantly teleport to the pieces destination. It would greatly enhance the user experience and help players to more efficiently figure out where somebody moved if we animated these arrows from the pieces start position to end position.

Here's how this would go:

1. In the normal method that renders all the arrows of all pieces, skip rendering the arrow of a piece currently being animated. (pieces currently being animated are held in the animation.js script)
2. Create a new method that renders the arrows of the animated piece, while it's been animated and ceases when the animation is over.

In addition, the mini images of the pieces when you are zoomed out should also be animated.