S4PropWrapper API

<span style="font-size:24px;">public class S4PropWrapper
本类包裹annotations，本类包含一个Proxy即代理，应该是对sphinx-annotation的给类进行反射的代理，以获得在annotation中各种默认设置。
public class S4PropWrapper {
    private final Proxy annotation;
    public S4PropWrapper(Proxy annotation) {
        this.annotation = annotation;
    }
    public Proxy getAnnotation() {
        return annotation;
    }
}</span>