GravitLauncher LaunchServer <=5.7.11 - Unauthenticated Path Traversal to Arbitrary File Read

LaunchServer's Netty FileServerHandler computes the served path by stripping one leading character on the assumption that every request-target begins with '/'. Netty's HttpServerCodec accepts a request-target without a leading slash verbatim, so a request without a leading slash bypasses path...