Add VSTS CI for Windows (#7536)

- Add VSTS CI for Windows
    - Disable `Access-denied test for Get-Item C:\windows\appcompat\Programs\Install -ErrorAction Stop`, because the path does not always exist
        - https://github.com/PowerShell/PowerShell/issues/7553
    - Disable `Should give .sys file if the fullpath is specified with hidden and force parameter`, because pagefile.sys doesn't always exist and other files don't meet test's requirement.
        - https://github.com/PowerShell/PowerShell/issues/7554
    - Disable some `Test-Connection` tests for same reasons they failed on VSTS Linux
        - https://github.com/PowerShell/PowerShell/issues/7555
    - Disable `Test-FileCatalog should pass when catalog is in the same folder as files being tested`, because the CmdLet does not work in that scenario
         - Also, give details needed to investigate when the test fails
         - https://github.com/PowerShell/PowerShell/issues/7556
    - Update `appveyor.psm1` to work with VSTS
    - Update `HelpersRemoting.psm1` `New-RemoteSession` to work for CimSession (discovered an issue during the investigation)
    - Update `Test wildcard with drive relative directory path` to work when there are multiple drives
         - Disable on non-windows machines since the test is assuming drive letters
    - Update `New-CimSession` Tests to requireAdmin
         - Also, make sure session name is a string
    - Add functions to save and restore psoptions
    - update `.gitatttributes` so files clone like they do on appveyor

.gitattributes

@@ -2,3 +2,5 @@ CHANGELOG.md merge=union
 * text=auto
 *.png binary
 *.rtf binary
+testablescript.ps1 text eol=lf
+TestFileCatalog.txt text eol=lf