Remove core
Squashed 'core/' content from commit 1ff92b7

git-subtree-dir: core
git-subtree-split: 1ff92b763c6025f04a9b247367c4c22010eabea4
Merge commit '1e14b0282f813be3805d53736f9605771f2b97cd' as 'core'
Squashed 'core/' changes from 1ff92b7..fd9e8b1

REVERT: 1ff92b7 Update CHANGELOG.md

git-subtree-dir: core
git-subtree-split: fd9e8b1db58ed42717a8879da9746033520fbdd5
Merge commit '789eda9a62ab14d69c562ed68f3084e40b0245b5' into develop
Squashed 'core/' changes from fd9e8b1..8b7050b

8b7050b Make OptionCallback non-static class

git-subtree-dir: core
git-subtree-split: 8b7050b5fc0ed46a56c353bcedf266c1983e9a6e
Merge commit '18976e7268874dd9f99ccb5b90519c788747a068' into develop
Bump version