Remove DeepCopy-Object entirely

As it was only used once, and the place where it was used could just
deep copy in place by adding properties to the clone.

Author: andyleejordan

GitHubCore.ps1

@@ -1059,8 +1059,8 @@ filter ConvertTo-SmarterObject
     }
     elseif ($InputObject -is [PSCustomObject])
     {
-        $clone = DeepCopy-Object -InputObject $InputObject
-        $properties = $clone.PSObject.Properties | Where-Object { $null -ne $_.Value }
+        $clone = [PSObject]::New()
+        $properties = $InputObject.PSObject.Properties | Where-Object { $null -ne $_.Value }
         foreach ($property in $properties)
         {
             # Convert known date properties from dates to real DateTime objects
@@ -1087,6 +1087,9 @@ filter ConvertTo-SmarterObject
             {
                 $property.Value = ConvertTo-SmarterObject -InputObject $property.Value
             }
+
+            # Add the property to the clone.
+            $clone.PSObject.Properties.Add([PSNoteProperty]::New($property.Name, $property.Value))
         }
 
         Write-Output -InputObject $clone

Helpers.ps1

@@ -360,46 +360,6 @@ function Write-InvocationLog
     Write-Log -Message "[$($Invocation.MyCommand.Module.Version)] Executing: $($Invocation.MyCommand) $($params -join ' ')" -Level Verbose
 }
 
-function DeepCopy-Object
-{
-<#
-    .SYNOPSIS
-        Creates a deep copy of a serializable object.
-
-    .DESCRIPTION
-        Creates a deep copy of a serializable object.
-        By default, PowerShell performs shallow copies (simple references)
-        when assigning objects from one variable to another.  This will
-        create full exact copies of the provided object so that they
-        can be manipulated independently of each other, provided that the
-        object being copied is serializable.
-
-        The Git repo for this module can be found here: http://aka.ms/PowerShellForGitHub
-
-    .PARAMETER InputObject
-        The object that is to be copied.  This must be serializable or this will fail.
-
-    .EXAMPLE
-        $bar = DeepCopy-Object -InputObject $foo
-        Assuming that $foo is serializable, $bar will now be an exact copy of $foo, but
-        any changes that you make to one will not affect the other.
-
-    .RETURNS
-        An exact copy of the PSObject that was just deep copied.
-#>
-    [CmdletBinding()]
-    [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseApprovedVerbs", "", Justification="Intentional.  This isn't exported, and needed to be explicit relative to Copy-Object.")]
-    param(
-        [Parameter(Mandatory)]
-        [PSCustomObject] $InputObject
-    )
-
-    $serialData = [System.Management.Automation.PSSerializer]::Serialize($InputObject, 64)
-    $DeepCopiedObject = [System.Management.Automation.PSSerializer]::Deserialize($serialData)
-
-    return $DeepCopiedObject
-}
-
 function New-TemporaryDirectory
 {
 <#