Added TagName and TagSet events

Core/src/org/sleuthkit/autopsy/casemodule/Case.java

...rg/sleuthkit/autopsy/casemodule/events/TagNamesEvent.java

...org/sleuthkit/autopsy/casemodule/events/TagSetsEvent.java

...uthkit/autopsy/casemodule/services/TagNameDefinition.java

...rg/sleuthkit/autopsy/casemodule/services/TagsManager.java

...report/modules/portablecase/PortableCaseReportModule.java

...g/sleuthkit/autopsy/imagegallery/ImageGalleryService.java