The ProjectionPicker is a single button widget for switching between perspective and orthographic projections.
    
| Name | Type | Description | 
|---|---|---|
| container | Element | String | The DOM element or ID that will contain the widget. | 
| scene | Scene | The Scene instance to use. | 
Throws:
- 
    DeveloperError : Element with id "container" does not exist in the document.
Example:
// In HTML head, include a link to the ProjectionPicker.css stylesheet,
// and in the body, include: <div id="projectionPickerContainer"></div>
// Note: This code assumes you already have a Scene instance.
const projectionPicker = new Cesium.ProjectionPicker('projectionPickerContainer', scene);Members
    Gets the parent container.
    Gets the view model.
Methods
    Destroys the widget.  Should be called if permanently
removing the widget from layout.
Returns:
    true if the object has been destroyed, false otherwise.
    
