Animatable items should have a `wait-for-animation` attribute

[jkomoros]

Originally captured in #396.

Should be on boardgame-animatable-item, so relies on #714

This is whether or not when transitions happen we should wait to install the next state until after the naimation is done. For boardgame-component the default is true, but for status-text and others it's false by default.

But can be overridden.

[jkomoros]

• [ ] update architecture.md
• [ ] update the "client animations" section of TUTORIAL