This release adds some new player commands and improves error handling
- Add the "next" CLI command and player method used to switch to the next track
- Add the "previous" CLI command and player method used to switch to the previous track
- Print an error message when no players are found in the CLI and propagate an error on initialization in this case in the library
- Print an error message when a command fails in the CLI and propagate an error in this case in the library