PowerShell ISE Addon: Validate and Format XML

I have been playing with XML documents a lot these days and at times I find myself dealing with a few pages long XML data. The most frustrating part is the un-formatted and invalid XML. May times, I find myself dealing with XML errors than any script errors. So, here is another addon to make life easy when using XML documents in PowerShell ISE. This addon actually comes with a couple of functions.