Add functions for configuration data handling and extend template merging capabilities

Private/Get-ConfigurationDataTemplateExtends.ps1

@@ -0,0 +1,31 @@
+function Get-ConfigurationDataTemplateExtends {
+    [CmdletBinding()]
+    Param(
+        [Parameter(Mandatory=$true)]
+        [System.Collections.IDictionary]
+        $ConfigurationData
+    )
+
+    $Extends = $null
+
+    if(Test-ConfigurationDataDictionaryKey -Dictionary $ConfigurationData -Key "Metadata"){
+        $Metadata = Get-ConfigurationDataDictionaryValue -Dictionary $ConfigurationData -Key "Metadata"
+        if($Metadata -is [System.Collections.IDictionary] -and (Test-ConfigurationDataDictionaryKey -Dictionary $Metadata -Key "Extends")){
+            $Extends = Get-ConfigurationDataDictionaryValue -Dictionary $Metadata -Key "Extends"
+        }
+    }
+
+    if($null -eq $Extends -and (Test-ConfigurationDataDictionaryKey -Dictionary $ConfigurationData -Key "Extends")){
+        $Extends = Get-ConfigurationDataDictionaryValue -Dictionary $ConfigurationData -Key "Extends"
+    }
+
+    if($null -eq $Extends){
+        return @()
+    }
+
+    if($Extends -is [System.Array] -and $Extends -isnot [string]){
+        return @($Extends)
+    }
+
+    return @($Extends)
+}