Selecting shapes and points

Using a jReality tool, I've enabled the ability to select shapes, points (vertices) on shapes. Works likes this:

```java
SelectTool selectTool = new SelectTool();
topCameraContainer.addTool(selectTool);
```
Then the user clicks on a shape...
```java
Shape currentShape = selectTool.getSelectedShape(allShapes);
```
Or get the point index of their click:
```java
int whichVertexDidTheyClick = selectTool.getPointSelection();
```

Simple, right?! :wink: