- Exit with code 1 when package was not installed
- Run a pre-step to check if package is installed before uninstalling. I have tried every possible way I could think of without that first `npm list` step based on output of `npm uninstall`, but different npm versions produce different outputs, so there is nothing reliable. This is a more robust way to do so anyway.
- Consolidate error handlers
It is on purpose that the message is the same than when a package was not installed. From a user standpoint, it only matters that this specific package was not installed.
- Hides progress bars that flash when installing/uninstalling as it does not bring real value here, at least for now
- Inform user if package being uninstalled was not actually installed
- Do not display npm outputs, mention which version was installed (this will probably need refining when installing packages with dependencies)
