Added: animOptions support with Keyframes

[dyuri]

Instead of manually handling "sub-slides", uses the new (currently unreleased) vizzu keyframes.

DO NOT RELEASE until vizzu keyframe support is released.

Closes #24.

[dyuri]

Switch from sub-slides to keyframes is basically done, need some cleanup to remove some unnecessary arrays and such.

[dyuri]

Subslide concept removed.

[veghdev]

@dyuri I merged main into it so it uses the correct Vizzu.
The expected test values should be fixed, but as I can see the feature does not work well. You can see in the docs example, for example only step 2 of the thrid slide is animated.

[dyuri]

I don't know how it's supposed to work, but since this player doesn't do much but calls the vizzu library, the issue might be there too. I've just removed the manual handling of sub-slides.

[simzer]

@dyuri The problem seems to be that while vizzu-story calls vizzu.animate with the list of keyframes now, it still stores only the end chart:

await this.vizzu.animate(animParams);
chartSteps.push(this.vizzu.store());

To be able to work correctly, it should store the whole animation:

let animation = this.vizzu.animate(animParams);
let control = await animation.activated;
chartSteps.push(control.store());
await animation;

[dyuri]

tests are broken due to the API change :/

[simzer]

See comment on the issue: #26 (comment)