Add functions for configuration data handling and extend template merging capabilities

Private/Test-ConfigurationDataDictionaryKey.ps1

@@ -0,0 +1,18 @@
+function Test-ConfigurationDataDictionaryKey {
+    [CmdletBinding()]
+    Param(
+        [Parameter(Mandatory=$true)]
+        [System.Collections.IDictionary]
+        $Dictionary,
+
+        [Parameter(Mandatory=$true)]
+        [string]
+        $Key
+    )
+
+    if($Dictionary -is [System.Collections.Specialized.OrderedDictionary]){
+        return $Dictionary.Contains($Key)
+    }
+
+    return $Dictionary.ContainsKey($Key)
+}