Animated transitions

[benjbach]

Animated transitions for switching attributes and styles.

[benjbach]

Create a TransitionObject with a timer that

• creates the interpolated values from the actual to the end value,
• set the value for each frame, and
• trigger the render once all objects have been updated.

[flomelki]

suggestion (if needed) : maybe could we make several type of interpolations, like "linear" or "logarithmic" and so on ?

[benjbach]

and slow-in-slow out. Yes, all doable!