Verbose option to toggle warning messages

[Harris Vijayagopal]

Any CLI command can come with package errors such as " We strongly recommend you activate the PTB sound engine in PsychoPy prefs as the preferred audio engine. Its timing is vastly superior. Your prefs are currently set to use ['sounddevice', 'PTB', 'pyo', 'pygame'] (in that order)". Include a verbose feature to toggle displaying warning messages from external packages and libraries