At least some of these changes seems to be useful. However, it would be better to split these changes into several PRs.
remove QtCreator project files (they are now obsolete)
move tools-related source files into separate directory
Fix cmake files if something is really broken, but try to avoid unnecessary changes
I see no reason to use Travis builds now. It would be better to use Github Actions instead of third-party service like Travis. And (maybe) this project doesn't need some CI at all, since it is no longer actively developed.
What is the purpose of file renamings? What was wrong with Cmake build? Please, describe this.