Make the install script action agnostic

scripts/Common/Scripts/Config.ps1

@@ -2,6 +2,12 @@ using namespace Microsoft.Win32;
 using namespace System.Security.AccessControl;
 using namespace System.Security.Principal;
 
+enum WindowsInstallerStage {
+    Initialize
+    Run
+    Completed
+}
+
 enum SetupStage {
     Configure
     Install
@@ -18,6 +24,7 @@ enum UserStage {
 $null = New-Module {
     [string] $configRoot = "HKLM:\Software\PortValhalla";
     [string] $stageOption = "Stage";
+    [string] $setupStageOption = "SetupStage";
     [string] $userOption = "SetupUser";
     [string] $userStageOption = "UserStage";
     [string] $accountOption = "MSAccount";
@@ -272,11 +279,44 @@ $null = New-Module {
 
     <#
         .SYNOPSIS
-        Gets the name of the current setup stage.
+        Gets the name of the current stage of the Windows install script action.
     #>
     function Get-Stage {
         $stage = Get-SetupOption $stageOption;
 
+        if ($null -ne $stage) {
+            $stage = [WindowsInstallerStage]$stage;
+        }
+
+        return $stage;
+    }
+
+    <#
+        .SYNOPSIS
+        Sets the name of the current stage of the Windows install script action.
+
+        .PARAMETER Name
+        The name of the stage to set.
+    #>
+    function Set-Stage {
+        param(
+            $Name
+        )
+
+        if (-not (($null -eq $Name) -or ($Name -is [string]))) {
+            $Name = ([WindowsInstallerStage]$Name).ToString();
+        }
+
+        $null = Set-SetupOption $stageOption $Name;
+    }
+
+    <#
+        .SYNOPSIS
+        Gets the name of the current setup stage.
+    #>
+    function Get-SetupStage {
+        $stage = Get-SetupOption $setupStageOption;
+
         if ($null -ne $stage) {
             $stage = [SetupStage]$stage;
         }
@@ -291,7 +331,7 @@ $null = New-Module {
         .PARAMETER Name
         The name to set the current stage to.
     #>
-    function Set-Stage {
+    function Set-SetupStage {
         param(
             $Name
         )
@@ -300,7 +340,7 @@ $null = New-Module {
             $Name = ([SetupStage]$Name).ToString();
         }
 
-        $null = Set-SetupOption $stageOption $Name;
+        $null = Set-SetupOption $setupStageOption $Name;
     }
 
     <#