Use LayerEvents dispatched by ArcGISHeatMapLayer instead of custom HeatMapEvent.

Remove unused events from layer and remove events no longer available from layer.
Use LayerEvents dispatched by ArcGISHeatMapLayer instead of custom HeatMapEvent.

Remove unused events from layer and remove events no longer available from layer.
Add sample to show how to use layer calculator functions added at version 3.1.
Merge branch '#12/update-samples-to-support-updated-layer-design-patterns' into develop