LDEV-4402 Remove obsolete XPP3 and XMLPull librariesThe libraries have been used by earlier versions of XStream. They arenot needed for latest XStream and Java 6+.Deserialized classes must implement a no-arg constructor.
LDEV-3275: Add missing dependencies. Update XStream to version 1.5.0, and its corresponding libraries. Reimplement LD attachment importing. Reimplement Content Repository credential check. Moja joda-time library to separate folder as it is not a part of XStream deployment anymore, but it is still needed in LAMS code.