1. Let the user know what commit it's reformatting in stdout
2. Add a debug mode to show the command that was launched
3. Fix output of errors
4. Allow the user to specify starting commit in an argument
It won't automatically be enforced, but should be picked up by editors
that support it (such as VS code + CPP extension)
It doesn't yet follow project style entirely, so more tweaking is
likely needed.
Also add a helper tool for reformatting new files to match project style
