More precise angles for the animation flow

[maddyb99]

The angle of the animation is currently selected based on one of the predefined 8 directions in the Alignment object. The proposal by @Kobatsu in #17 is to introduce custom angles in this.

There is an angle on the shimmer effect that we can tweak with predefined values, would it be possible to chose more precisely the angle instead of predefined values only?
I saw that it relies on the Alignment object so I guess it can be 🤔

Need to think over and implement this solution