Removed cling source code.
Split 'common/' into commit '426c3b915a5c0acd999f79ef4baadb8269ddf794'

git-subtree-dir: common
git-subtree-mainline: 6c76e6a1226bb27e29b68751935fe49e1bd8bf45
git-subtree-split: 426c3b915a5c0acd999f79ef4baadb8269ddf794