James Brundage

* [ ] #325 * [ ] #327 * [ ] #332 * [ ] #333

This will enable these parts of PowerShell to be more easily extended within Posh

### Description Custom argument completers are a decent part of user experience in PowerShell. They should be easy to create and manage with scriptproperties and psuedotypes (possibly in $Posh.Commands)

Now that [EZOut supports multiple file output](https://github.com/StartAutomating/EZOut/releases/tag/v2.0.2), Posh should split up the files it produces. At the least, we should split the implementation into "purely Posh" extended types and "System"...

Posh already extends the $host object slightly, by adding .Width/.Height We should go beyond this point * [x] #130 * [x] #131 * [ ] #132 * [ ] #133...