[MSHADE-358] Support directories/wildcards by AppendingTransformer

**[dzikoysk](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=dzikoysk)** opened **[MSHADE-358](https://issues.apache.org/jira/browse/MSHADE-358?redirect=false)** and commented

At this moment, [AppendingTransformer](https://github.com/apache/maven-shade-plugin/blob/master/src/main/java/org/apache/maven/plugins/shade/resource/AppendingTransformer.java) supports only specific files that we list in the configuration. It causes problems if we don't know names of files that we want to merge (a lot of e.g. annotation scanning libraries uses class names without any extensions). To solve this problem the transformer could just simply accept directories as resource or wildcards in resource names.

```java

META-INF/annotations/*

```

---

**Remote Links:**
- [GitHub Pull Request #40
](https://github.com/apache/maven-shade-plugin/pull/40)

Start with src/main/java/org/apache/maven/plugins/shade/resource/AppendingTransformer.java and inspect how configured resource names are matched. Use the META-INF/annotations/* example as the acceptance case; done means directory or wildcard resources can be merged without listing each specific file.

Written by the indexing model from the issue text.