4.0.0-RC3

• monitoring
  • merged events and added some new for impersonate, refresh + requestMe...
  • added ActiveUserStore to track current active users
• mailing
  • upgraded to new emai-template-builder with new theme of postmark
  • upgraded to new email-templates and improved configurations for logo
  • refactor: removed spring-boot-starter-mail + introduced EmailSender interface and refactored tests by this step
  • introduced extra module commons-auth-email-smtp to allow default config for spring-boot-starter-mail
  • added postmark sender als alternative to smtp version
• jpa
  • removed fetch.EAGER to improve performance when used entity as relations
• fixes
  • never set avatar to null when avatarService is active