UI-2882 Clean old source ECMS
Revert "UI-2882 Clean old source ECMS"

This reverts commit 0e4350581fc0bb0426aa7b6d9bcddfbde7abb324.
WIKI-156 / DEP-38 : Update depmgt to version 8 to upgrade version of XWiki to version 5.0.2
Merge branch 'master' into feature/stabilization