Windows PowerShell port

This PR introduces a PowerShell port of the original bash script that can be run on Windows.

To run from a PowerShell console, simply:

	./bin/support-diagnostics.ps1

The script accepts all of the command line arguments that the original bash script accepts.

The output is a zip file instead of a tarball.  I also tried to keep variable names as similar as possible to the original script, as well as the general flow / order of operations in effort to make cross-maintenance a little easier.
Is there a benefit to us creating an uncompressed zip file? In the Unix version, it's the different between a compressed tarball and an uncompressed one. In this case, it just seems weird to use _zip_ without compression. There could easily be a good reason for it though.