Here's a proposal I have developed to solve the same problem: https://www.toolsconfig.org/
The onus is on the tools developers to adopt this change. And the proposal allows for the gradual, graceful migration from current status to a place where all such files are stored in a central location.
The directory name `.toolsconfig`, or `.tc` is the best I could recommend, since `config` or `.config` can be safely assumed to be already in use. Using 'tools' in the directory name also makes it explicit as to whose config files are stored in there; tools developers use, not the config of the projecct itself.
Edit: The Git repo of the proposal is hosted on Github. Feel free to propose any changes or improvements to the proposal or the algorithm.
https://github.com/DrPostgres/ToolsConfig/ https://www.toolsconfig.org/