Fix `thelounge uninstall` command
Fix `thelounge uninstall` command

- 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

ScoutLink/lounge,williamboman/lounge,realies/lounge,thelounge/lounge,MaxLeiter/lounge,ScoutLink/lounge,williamboman/lounge,MaxLeiter/lounge,thelounge/lounge,FryDay/lounge,realies/lounge,williamboman/lounge,FryDay/lounge,realies/lounge,FryDay/lounge,ScoutLink/lounge,MaxLeiter/lounge