Use Mojo annotations instead of Javadoc tags

[Marcono1234]

Currently the ProGuardMojo uses Javadoc tags to define Mojo settings and parameters. That seems to be the legacy approach and using the corresponding Java annotations (e.g. @Mojo and @Parameter) should be preferred nowadays.

The Maven builds also produce these warnings currently:

[WARNING] Deprecated extractor java-javadoc extracted 1 descriptor. Upgrade your Mojo definitions.
[WARNING] You should use Mojo Annotations instead of Javadoc tags.

If you want I can give it a try in the next days or weeks.

[lasselindqvist]

Sure