Initial commit
Add 'core/' from commit '2c8662cf9ea636b18f7d60780b820bf4dbc307ba'

git-subtree-dir: core
git-subtree-mainline: e4083fd7bf0381d0bd038aa297d51b8ed4eb6daf
git-subtree-split: 2c8662cf9ea636b18f7d60780b820bf4dbc307ba