evaluate usage of configuration section in plugin to replace '.mvn/jgitver.config.xml'

as described in [Gitter](https://gitter.im/jgitver/Lobby?at=5d8b10be63b06968fbe59c1a) : https://gitter.im/jgitver/Lobby?at=5d8b10be63b06968fbe59c1a we could think of using a configuration section of a jgitver plugin to replace the `.mvn/jgitver.config.xml` file.

__NOTE:__ there could be tradeoffs in this usage and thus some POCs to do because jgitver comes into the party before/during the full evaluation of the POM:

- regarding properties evaluation inside the configuration
- regarding parent POM plugin/config definition
- ...