[MRESOURCES-281] allow different encodings for files inside the same resource-directory

**[Carsten Rohde](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=JIRAUSER284599)** opened **[MRESOURCES-281](https://issues.apache.org/jira/browse/MRESOURCES-281?redirect=false)** and commented

Currently each resource-directory has a single encoding, with the recent exception of properties (MRESOURCES-171).

If you need to filter differently encoded files, this can become quite a hazzle: The only way (at least that I'm aware of) is to have different modules or non-resource directories as the source for copy-resources. Apart from bloating the pom, it also forces you to have related files at different locations if they are encoded differently.

What I'm suggesting is to generalize what has been done for properties by allowing to override the \ for specific files/patterns.

Ideally this would be part of the resource-declaration but being able to configure the resources plugin accordingly would already help a lot:

```java

UTF-16
**/*.myfile


iso-latin-1
**/*.other

What do you think?
```

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**Affects:** 3.2.0

**Issue Links:**
- [MRESOURCES-88](https://issues.apache.org/jira/browse/MRESOURCES-88) Allow specific encoding per group of files