Improve specification of output types for the cmdlets

[ChristopherMann]

Currently, most of the Cmdlets specify multiple types for [OutputType]. We should improve this by specifying parameter sets which only have single type for [OutputType].

The most common situation combines Operation and the actual result type. We know if the Cmdlet returns an Operation or not depending on the NoWait parameter.

AB#714

[fw2568]

We should also add output type formats for most common outputs. This would make the output much nicer.