scroom & @scroom/react 1.x

Features (core)

1. Support horizontal direction.
2. Performance improving.
3. New debug UI

Breaking Change (core)

1. Use "createScroom" to create a scroom instance;
2. Use "px" for threshold now;
3. Use standard event listener

Features (react)

1. Adapted to scroom v1.x.
2. Support event callback
3. Support debug id