Some libraries are included in this repository using a so called git subtree. A git subtree is essentially just a copy another repository that is saved in this Tomb Editor repository. General information about git subtrees: https://www.atlassian.com/blog/git/alternatives-to-git-submodule-git-subtree
Subtree https://github.com/Lwmte/DarkUI
git subtree pull --prefix DarkUI https://github.com/Lwmte/DarkUI.git master --squash
git subtree push --prefix DarkUI https://github.com/Lwmte/DarkUI.git master
git remote add UpstreamDarkUI https://github.com/Lwmte/DarkUI.git
git fetch UpstreamDarkUI
git subtree push --prefix DarkUI UpstreamDarkUI master