split attributeChangedCallback in two functions

[timomayer]

i liked @vascocosta-vi suggestion to split up

  attributeChangedCallback(name, previous, current) {
    super.attributeChangedCallback(name, previous, current);
    console.log('third', name);
  }

into two functions suggestion
attributeBeforeChangeCallback
attributeChangedCallback

@tiagomapmarques @SheepFromHeaven ?

[tiagomapmarques]

Suggestion from @timomayer and me:

  beforePropsChanged(name, previous, current) {
    console.log('second', name);
  }

  afterPropsChanged(name, previous, current) {
    console.log('third', name);
  }