- Tweens can now use a custom easing curve, in addition to the built-in named easings (`linear`, `easeInQuad`, ...). A custom curve is written like in CSS: `"cubic-bezier(x1,y1,x2,y2)"`.
- The easing field gets a Custom curve... entry that opens a visual curve editor.
- New custom easing can be named and reused across the project (or across an extension)
Co-authored-by: Viktor Vovk <[email protected]>