Removed antimatter theme, will be readded as subtree
Squashed 'user/themes/antimatter/' content from commit 9a75b13

git-subtree-dir: user/themes/antimatter
git-subtree-split: 9a75b13fb543e6e8ae9204753eae60136c456aab
Merge commit '7bc3dee402afae5a3448b059a886c33f64e5ab2c' as 'user/themes/antimatter'