Rewrite for remoting, objects and parallel processing

[FriedrichWeinmann]

Issue:
Original script while doing its job didn't scale well

Reason:
Needed this to scale out to hundreds of Exchange Servers

Fix:
Rewrite as functions with remoting and parallel processing capabilities

[bill-long]

Thank you! This is a huge change, so we'll need to do some testing before merging this.

[bill-long]

Example output from this version:

[bill-long]

This branch seems to contain the original blog commands without the performance improvements from Test-Hafnium. For example:

...

Versus the current Test-Hafnium:

...

The current Test-Hafnium takes 6 seconds. The rewrite takes over 2 minutes. We need to bring over all the performance work.

[bill-long]

Example output from latest revision. Note we now simply pipe the servers to the script: