Announcing Brise theme

Brise theme is yet another fork of Breeze. The name comes having both the French and German translations of Breeze, being Brise. As some people know, I’m contributing quite a lot to the Breeze style for the Plasma 6 release and I don’t intend to stop doing that. Both git repositories share the same git history and I didn’t massively rename all the C++ classes from BreeseStyle to BriseStyle to make it as easy as possible to backport commits from one repository to the other.