Feature/simple spinning

[infeo]

This is a follow up PR of #1704 .

The spinning logic is simplyfied by just rotating the IconView on certain conditions. The rotation is sequence of discrete rotations by 45° angle each. The subscription for the rotation needs to be stored because its binding is only weak and would be otherwise gc'ed.

Any appearance of class ProgressSpinner is replaced by a rotating IconView except in the health package due to outstanding PR #1712 .

[overheadhunter]

Factories and Builder are pretty nice, however due to the number of duplications, I'd suggest to add a new class to org.cryptomator.ui.controls and use it from within the fxml files:

public class Spinner extends FontAwesome5IconView {
    public Spinner(@NamedArg("spinning") ObservableValue<Boolean> spinning) {
        setGlyph(FontAwesome5Icon.SPINNER);
        var animation = Animations.createDiscrete360Rotation(this);
        this.animator = AutoAnimator.animate(animation)) //
 				.onCondition(spinning) //
 				.afterStop(() -> setRotate(0)) //
 				.build();
    }
}