Settings file in repository to configure disagnostics and clang tools

So far user have to set it by hand but sometimes the project want to set some diagnostics settings or/and clang tool settings. So every developer gets the same warnings and fix its. It's a little bit like a style guide coded in Clang checks. And because it's automatic it's much easier to follow. So it would be nice to have something like ".clang-tidy" but in a general way. One for clang tool settings and one for diagnostics because some of the checks can be to slow for diagnostics.