I think we all agree: `start` will be deprecated as an attribute.
We need a replacement that implies both that the animator will start immediately, and also that it can be stopped and restarted by toggling the value. Proposals have included `started`, `autostart`, `autorun`, and `enabled`. I have one more: `applied` This has precedent from <state>. A <state> is applied or removed by setting `applied` to `true` or `false`. I think there is a reasonable parallel with animators. When the animator is applied, it starts from it's initial state and animates the designated attribute according to the animator's parameters. When the animator is unapplied, it stops animating (and leaves the animated property where it last was). Reapplying an animator starts it from its initial state. (You use `paused` if you want to suspend and resume the animator.)
