add co-authors if available to changeset view

refactor ChangesetAuthor.tsx

get interfaces right / fix unit test / cleanup

fix table layout

use Set constructor injection to bind the implementation for the new changesetTrailers API

cleanup / update CHANGELOG.md

cleanup

fix formatting

scm-webapp/src/main/java/sonia/scm/lifecycle/modules/ScmServletModule.java

@@ -111,7 +111,6 @@ import sonia.scm.web.security.DefaultAdministrationContext;
 import javax.net.ssl.SSLContext;
 
 /**
- *
  * @author Sebastian Sdorra
  */
 class ScmServletModule extends ServletModule {