Add support for ErrorAction argument

[fiasko]

When Set-AudioDevice or Get-AudioDevice is called either with invalid Index number of device ID, the fuctions return a visible error and nothing else. Not even a $null value as a return value. When valid funtcion return value cant't be given (in case of error) it would be good to have a $null value as result, so that I could use these functions in my own scripts and detect when the calls failed. Also it would be good if the function could support '-ErrorAction' parameters as well, so that visible error messages could be suppressed.

[God-damnit-all]

While I'd like this too, I'm hoping 3.1 is released beforehand.