Animated bubble chart refactoring

[objerke]

This code refactor of the animated bubble chart aims to solve a few issues that are present in the current version.

Issues:

• When the mod is stressed, e.g. by marking very quickly, the rendering code can get out of sync and start reading from a disposed data view. This leads to a blank canvas and it can't recover until it is fully re-rendered.
• The other issue concerns the highlight feature. When the visualization is animating, it is possible to pause the animation by hovering over a circle. The current version does not stop immediately when entering over a circle and it is possible to see a slight shift of the highlight ring and the circle.

The refactoring solves both these issues.

• The visualization is no longer rendering DataViewRows. Instead it is rendering a Frame with Bubbles. The frames are handled by an AnimationControl, which is also responsible for the animation speed and the current index.
• The transition effect between frames is paused immediately when hovering over a bubble. The transition starts again after a few hundred milliseconds when leaving the bubble. The small pause is meant to simplify movement between bubbles.

The code flow is as follows:

• Data and property changes enter into the subscribe loop of main.ts
• Frames are created and passed into the long lived animation control instance.
• The animation control renders the visualization fully (index.ts:render) when receiving changes from main.ts
• When starting the animation, the animation control will call the update code to only change the position of the bubbles.