Code completion for class/interface names in beans.xml

1. <alternatives><class>| - the list of all available classes annotated @Alternative
2. <alternatives><stereotype>| - the list of all available stereotypes annotated @Alternative
3. <decorators><class>| - the list of all available decorator classes
4. <interceptors><class>| - the list of all available interceptor classes

Filtering for both short and fully qualified class/interface names should work.