Fix copyright year
Revert public interface semantic zoom class visualization to look more like the default visualization
Revert the public interface semantic zoom method visualization to look more like the default visualization
Add visualization choice strategy type over semantic zoom over purpose
Fix copyright year
Change default visualization choice strategy
Add functions to retrieve registered purpose- and semantic zoom level-ids by name
Add functions to register visualizations providing the name of the purpose or semantic zoom level it should be registered for
Update visualization registration to use new registration by name
Fix some graphic issues when scaling items