init Core
Add 'Modules/Core/' from commit 'd990488682ca17a53000ef59d5db8ca481998972'

git-subtree-dir: Modules/Core
git-subtree-mainline: 4644ac6fcb148f4c5a4e204034da69c106a75279
git-subtree-split: d990488682ca17a53000ef59d5db8ca481998972