In converting JavaScript to TypeScript, we must create class attribute declarations for `this` properties assigned in the
constructor. Visit each constructor and follow these patterns:

1. Look for nearby `@private` or `@public` annotations. If uncertain, prefer to mark as `private`.
2. Prefer to mark as `readonly` unless you are certain it will be reassigned. If unsure, mark as `readonly`.
3. Documentation about the attribute should move to the class attribute declaration. This will be most of the documentation
Any documentation that is specific to the instantiation of the attribute should remain in the constructor.
4. Use context to infer types. If a type is uncertain, use the phet-core type `phet-core/js/types/IntentionalAny`.
5. Changes should be in comments and type space only. DO NOT change runtime behavior.
6. Delete code comments from the constructor if it was moved to the class attribute declaration.
7. Do not remove/change existing documentation. Preserve it. (OK to move it though).

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EXAMPLE 1

INPUT:
    // @public - emits an event whenever a track changes in some way (control points dragged, track split apart,
    // track dragged, track deleted or scene changed, etc...)
    this.trackChangedEmitter = new Emitter();

OUTPUT at class attribute declaration:

  // emits an event whenever a track changes in some way (control points dragged, track split apart,
  // track dragged, track deleted or scene changed, etc...)
  public readonly trackChangedEmitter: Emitter;

LEAVE this part in the constuctor:

this.trackChangedEmitter = new Emitter();

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EXAMPLE 2

INPUT:
    // @public - model for visibility of various view parameters
    this.pieChartVisibleProperty = new BooleanProperty( false, {
      tandem: tandem.createTandem( 'pieChartVisibleProperty' )
    } );

OUTPUT at class attribute declaration:

  // model for visibility of various view parameters
  public readonly pieChartVisibleProperty: BooleanProperty;

LEAVE this part in the constructor:

    this.pieChartVisibleProperty = new BooleanProperty( false, {
      tandem: tandem.createTandem( 'pieChartVisibleProperty' )
    } );

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