[MNG-7133] Allow to inline collection/array items within plugin root configuration

**[Slawomir Jaranowski](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=slawekjaranowski)** opened **[MNG-7133](https://issues.apache.org/jira/browse/MNG-7133?redirect=false)** and commented

Currently we can have plugin configurations like:

```xml

Foo*
Bar*

```

But when we have plugin configuration like:

```xml

Foo*
Bar*

```

and add method `addListParam` to Plugin mojo class this is not working.

`addListParam` method on plugin level is **called only once**

Plugin code:

```java
public class MyMojo extends AbstractMojo {

@Parameter
private List listParam;

/**
* special method called when inline collection in configuration is used.
*/
public void addListParam(String value) {
listParam.add(value);
}
}
```

---

**Affects:** 3.6.3

**Issue Links:**
- [MNGSITE-445](https://issues.apache.org/jira/browse/MNGSITE-445) Document "inlined collections" approach for plugin configuration

- [MNG-5033](https://issues.apache.org/jira/browse/MNG-5033) Allow to inline collection/array items within plugin configuration

**Remote Links:**
- [GitHub Pull Request #464
](https://github.com/apache/maven/pull/464)

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