[geotk] migration to java 11

[Martin Desruisseaux]

Hello Juergen

Indeed the dependencies on maven.geotoolkit.org seems broken. The 
5.0.0-MC0082 version should not be there, it seems to have been deployed 
by mistake. That version can not work because it has missing 
dependencies. I will delete it.

The snapshots on the other hand should have all their dependencies 
deployed, which is why I suggested them. Alternatively the repository 
proposed by Alexis should work too. But as he said, it contains only 
milestones, not really releases. The only real releases that we are 
doing at this time are Apache SIS, and we are trying to make it more 
complete (but it takes time).

Please let us know if we can help in other ways.

     Martin