Cleanup and Sonar issues;
Refactored SecurityInterceptor to meet Sonar complexity issue;
Split Keyserver and Encryption utility methods into two separate
classes; Move KeyserverUtils to models bundle and use it there; Only
provide URL-safe base64 encryptions (regarding "/" in REST calls);
Authenticate and delete app via REST;
Include XML libs in keyserver-rest for validation XML (if
Accept=application/json is not set);