Support for force scanning against Windows Update

[codaamok]

Hey, I hope you're well! Don't merge just yet, I have a question 😄

I have done two things in this PR:

• Added support to specify -UseWindowsUpdate in Get-KbNeededUpdate; this lets users "forcefully" search against Windows Update even if Windows is configured to scan against WSUS - achieved by just setting ServerSelection to 2 on the UpdateServer interface.
• Removed -Credential parameter from Connect-KbWsusServer as it wasn't used

Do I need to do anything special to build the module in order to test with it? I still need to some more testing but initial testing proves OK. Right now I'm just modifying locally and importing the module from the repository.

[potatoqualitee]

thanks so much @codaamok! no, you do not need anything special other than sometimes using -Force when using Import-Module to ensure your changes are enabled. This change looks solid and the integration tests pass 😊

[codaamok]

I made some more changes:

• Forgot to add DefaultParameterSetName attribute; it threw an error not knowing which param set to use when the function was called without any params
• I made somewhat of an overhaul in the comment based help and readme to
  • consistently named the Windows Update cloud service as "Windows Update (cloud service)", instead of "Microsoft update catalog"
  • consistently named the Windows Update offline scan file (wsusscn2.cab) as such
  • consistently name the Windows Update Agent so it wasn't confused with Windows Update (the cloud service)

Let me know your thoughts

[codaamok]

Oh I think I'll add -UseWindowsUpdate in Install-KbUpdate, too

[potatoqualitee]

Thanks again, this code looks great -- appreciate the added functionality 👍🏼 Will merge and publish once tests pass again.