Delete subhook submodule
Squashed 'deps/subhook/' content from commit df95b92

git-subtree-dir: deps/subhook
git-subtree-split: df95b921b9488ffbe24a1ab4f56825275e09077f
Merge commit 'a73dedcab90648056ec19ff1b0217290bb5633f5' as 'deps/subhook'