Parameterization snippet should be separated out to a function

[briantist]

The nature of this snippet seemingly makes it difficult to put in its own function because it relies on 2 variables that are auto-populated based on the current function ($PSBoundParameters and $MyInvocation), however this is possible by taking these as parameters; the invoking function then passes these in.

I'm thinking of this approach from the point of view of another meta function I created to treat parameters as required without prompting.

The advantages of this are not having a hard-coded variable name in the result, not adding additional worker variables, and clearer separation / less repeated code.

I'm somewhat thinking of uses outside of this module (the usage within this module would still be repeating lots of code but it's auto-generated at runtime so I don't care).

This came about from working on issue #22

[briantist]

Resolved in #24