可否在用XE.earth生成viewer时传入Cesium.viewer的参数呢？

想问个问题：可否在用XE.earth生成viewer时传入Cesium.viewer的参数呢？有些参数比如shouldAnimate，homeButton一类在viewer生成后无法或不方便设置。

可以设置的，效果如下：


代码在这里：

```
// earth = new XE.Earth('earthContainer');
earth = new XE.Earth('earthContainer', {
// 这里设置Viewer的配置，和new Viewer(container, options)中的options一致
homeButton: true,
timeline: true,
});
```

Start at the XE.Earth constructor or viewer-creation entry point and compare its arguments with Cesium's new Viewer(container, options) API. Verify that options such as shouldAnimate, homeButton, and timeline are accepted; done means creating XE.Earth with the shown options produces the requested Viewer behavior and controls.

Written by the indexing model from the issue text.