Keep build and run configurations in separate files

Maintaining build and run configurations involves a lot of clicks. Especially when a project/executable contains plenty of them and needs additional parameters this can be time-consuming. Let it be environment variables, command line arguments or just project build settings. It seems impossible to easily share such configurations in a team and to put them under version control. When the user file is removed by accident, there is no way to recover.

VSCode uses straight-forward "launch.json" files in a .vscode subfolder which are not editable via GUI, but which are simple and straight-forward to write. QtCreator's XML files are not convenient to edit and cannot be written in a host-independent way and thus, should not be put under version control.

I believe QtCreator could do even better:

• Allow to have .json or .yaml files in a .qtcreator project subfolder where one could specify build and run configurations
• Allow to have multiple files and merge them
• Make these configurations read-only in the GUI