livingobject.js / processing pipeline

• states processing can only be performed at the start of a frame, during `TU`.
• frame transitions can only happen when `wait` reaches 0, and at the end of a frame, during `transition`.
• a living object remains statefully static between `TU` and `transition`. in other words, no stateful changes can be made in between.
• states handle combo events before transition, but the handlers can do nothing more than determining which frame to transit to.
• keyboard input is buffered, and only before `transition` will a living object fetch for inputs.
• between `TU` and `transition`, there can be other processes. see multi- processing for more info.