LDEV-3665: Use Java 8 time API instead of Joda library in LAMS core. Use Joda time library shipped with Wildfly for lams_saml project, which needs it for OpenSaml 2.6 library.
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.