allow multiple simultaneous code formatters not interfering (BB-13548)

Most coders are much more productive when using their own preferred code formatting (more than just whitespace variations). However, working together via a repo, they're usually forced to at least read in different formatting, in order to not 'fire changes' on the codebase where in reality they're only 'styling' variations. What about a 'behind the scenes' code formatting on synching with the repo in both directions?