Update PSEdition values to Rename Desktop & Core to WindowsPowerShell and PowerShellCore

$PSVersionTable.PSEdition currently supports Desktop and Core enums.
Because PowerShell is going to be Open and also available on Linux/Mac
from August, we decided to rename these values so as to make it clear to
the end user.
We decided to use the names WindowsPowerShell,PowerShellCore.

src/Modules/Shared/Microsoft.PowerShell.Utility/Microsoft.PowerShell.Utility.psm1

@@ -587,7 +587,7 @@ function ConvertFrom-SddlString
     Begin
     {
         # On CoreCLR CryptoKeyRights and ActiveDirectoryRights are not supported.
-        if ($PSEdition -eq "Core" -and ($Type -eq "CryptoKeyRights" -or $Type -eq "ActiveDirectoryRights"))
+        if ($PSEdition -eq "PowerShellCore" -and ($Type -eq "CryptoKeyRights" -or $Type -eq "ActiveDirectoryRights"))
         {
             $errorId = "TypeNotSupported"
             $errorCategory = [System.Management.Automation.ErrorCategory]::InvalidArgument
@@ -622,7 +622,7 @@ function ConvertFrom-SddlString
         {
             param($AccessMask, $Type)
 
-            if ($PSEdition -eq "Core")
+            if ($PSEdition -eq "PowerShellCore")
             {
                 ## All the types of access rights understood by .NET Core
                 $rightTypes = [Ordered] @{

src/Modules/Shared/PowerShellGet/PSModule.psm1

@@ -12542,7 +12542,7 @@ function Update-ModuleManifest
         $ProcessorArchitecture,
 
         [Parameter()]
-        [ValidateSet('Desktop','Core')]
+        [ValidateSet('WindowsPowerShell','PowerShellCore')]
         [string[]]
         $CompatiblePSEditions,
 
@@ -14144,6 +14144,8 @@ function Test-MicrosoftCertificate
         $AuthenticodeSignature
     )
 
+    $result = $false
+
     if($AuthenticodeSignature.SignerCertificate)
     {
         try
@@ -14157,10 +14159,11 @@ function Test-MicrosoftCertificate
         }
 
         $SafeX509ChainHandle = [Microsoft.PowerShell.Commands.PowerShellGet.Win32Helpers]::CertDuplicateCertificateChain($X509Chain.ChainContext)
-        return [Microsoft.PowerShell.Commands.PowerShellGet.Win32Helpers]::IsMicrosoftCertificate($SafeX509ChainHandle)
+        $result = [Microsoft.PowerShell.Commands.PowerShellGet.Win32Helpers]::IsMicrosoftCertificate($SafeX509ChainHandle)
+        $SafeX509ChainHandle.Close()
     }
 
-    return $false
+    return $result
 }
 
 function Test-ValidManifestModule

src/System.Management.Automation/engine/Modules/NewModuleManifestCommand.cs

@@ -386,7 +386,7 @@ namespace Microsoft.PowerShell.Commands
         /// </summary>
         [Parameter]
         [AllowEmptyCollection]
-        [ValidateSet("Desktop", "Core")]
+        [ValidateSet("WindowsPowerShell", "PowerShellCore")]
         [SuppressMessage("Microsoft.Performance",
             "CA1819:PropertiesShouldNotReturnArrays", Justification = "Cmdlets use arrays for parameters.")]
         public string[] CompatiblePSEditions

src/System.Management.Automation/engine/PSVersionInfo.cs

@@ -47,11 +47,9 @@ namespace System.Management.Automation
         /// Linux -- All PS on Linux flavors. This may need to be subdivided based on compatibility between distros.
         /// </remarks>
 #if !CORECLR
-        internal const string PSEditionValue = "Desktop";
-#elif LINUX
-        internal const string PSEditionValue = "Linux";
+        internal const string PSEditionValue = "WindowsPowerShell";
 #else
-        internal const string PSEditionValue = "Core";
+        internal const string PSEditionValue = "PowerShellCore";
 #endif
 
         // Static Constructor.

src/System.Management.Automation/engine/Utils.cs

@@ -71,7 +71,7 @@ namespace System.Management.Automation
         /// <summary>
         /// Allowed PowerShell Editions
         /// </summary>
-        internal static string[] AllowedEditionValues = { "Desktop", "Core" };
+        internal static string[] AllowedEditionValues = { "WindowsPowerShell", "PowerShellCore" };
 
         /// <summary>
         /// helper fn to check byte[] arg for null.