AzureAuth Windows uninstall script

[Emilio0404]

Added a script to uninstall AzureAuth easily. The script handles the removal of the default AzureAuth installation folder, and updates the PATH to not contain any references to AzureAuth.

Right now, it was tested manually, but integration tests are coming soon.

From issue: #121

[shalinikhare27]

@Emilio0404 - We can just edit the title as AzureAuth uninstall script :)

[reillysiemens]

@Emilio0404, this is a great first AzureAuth PR. I have a couple of thoughts/questions for you, but overall I think you're on the right track. I think the biggest thing to sort out will be whether we can reasonably support uninstalling from custom locations.

[reillysiemens]

@Emilio0404: I appreciate your willingness to keep iterating on this. It seems like you're still working through some of this, so feel free to consider a draft PR if you're not ready for more review.

I've left some more granular, but minor feedback after your last changes. At a high level I want to suggest that maybe you could just delete the entire default installation location instead of individually removing subdirectories thereof.

Basically, this:

1. Discover all paths where AzureAuth might be.
2. Just delete the entire %LOCALAPPDATA%\Programs\AzureAuth directory.
3. Clean up paths you deleted from %PATH% (these will be subdirectories of the above).
4. Output that you've uninstalled AzureAuth.
5. As a courtesy, output non-overlapping paths from step 1 (things you can't actually safely delete).

I think this might simplify some of your current logic.

@mvanchaa, @shalinikhare27, @Haard30: Would love your feedback on the above steps. ☝️