Better handling of deprecated members in Animation
Better handling of deprecated members in Animation

* Delegate deprecated `Animation._step` to `Animation.cur_step`
* Move deprecated `Animation.run` to its end

ManiacalLabs/BiblioPixel,rec/BiblioPixel,ManiacalLabs/BiblioPixel,ManiacalLabs/BiblioPixel,rec/BiblioPixel,rec/BiblioPixel,rec/BiblioPixel,ManiacalLabs/BiblioPixel