[MNG-6603] XDG Base Directory Specification support

**[Julien Nicoulaud](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=nicoulaj)** opened **[MNG-6603](https://issues.apache.org/jira/browse/MNG-6603?redirect=false)** and commented

Could Maven please follow the XDG Base Directory Specification for the configuration/data directory on linux?

More infos here:
* http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
* http://www.freedesktop.org/wiki/Software/pyxdg
* https://wiki.archlinux.org/index.php/XDG_Base_Directory#Support

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**Affects:** 3.6.0

**Issue Links:**
- [MNG-7914](https://issues.apache.org/jira/browse/MNG-7914) Add a new maven.properties file

- [MNG-8344](https://issues.apache.org/jira/browse/MNG-8344) Support multiple operators in variable expansion
(_**"requires"**_)

3 votes, 10 watchers