Clean up xml in cnf files

Indentation was not satisfactory. Improves readability and presentation of cnf files created

Thanks to @dkgroot for proposing this improvement

module.xml

@@ -1,7 +1,7 @@
 <module>
 	<rawname>sccp_manager</rawname>
 	<name>SCCP Manager</name>
-	<version>14.3.0.1</version>
+	<version>14.3.0.0</version>
 	<type>setup</type>
 	<category>SCCP Connectivity</category>
 	<publisher>Steve Lad, Alex GP</publisher>

sccpManClasses/xmlinterface.class.php

@@ -112,7 +112,7 @@ class xmlinterface
                     $node->addAttribute('model', $var['vendor'] . ' ' . $var['model']);
                 }
             }
-            $xml_work->asXml($xml_name);  // Save  XMLDefault1.cnf.xml
+            \FreePBX::Sccp_manager()->saveXml($xml_work, $xml_name);  // Save  XMLDefault1.cnf.xml
         }
     }
 
@@ -347,7 +347,7 @@ class xmlinterface
             }
         }
 
-        $xml_work->asXml($xml_name);  // Save
+        \FreePBX::Sccp_manager()->saveXml($xml_work, $xml_name);  // Save
 
         return time();
     }
@@ -667,7 +667,7 @@ class xmlinterface
                 }
             }
 
-            $xml_work->asXml($xml_name);  // Save
+            \FreePBX::Sccp_manager()->saveXml($xml_work, $xml_name);  // Save
         } else {
             die('Error Hardware template :' . $xml_template . ' not found');
         }

sccpManTraits/helperFunctions.php

@@ -213,6 +213,15 @@ trait helperfunctions {
         return false;
     }
 
+    // temporary helper function to save xml with proper indentation
+    public function saveXml($xml, $filename) {
+       $dom = new \DOMDocument("1.0");
+       $dom->preserveWhiteSpace = false;
+       $dom->formatOutput = true;
+       $dom->loadXML($xml->asXML());
+       $dom->save($filename);
+    }
+
     public function initVarfromXml() {
         if ((array) $this->xml_data) {
             foreach ($this->xml_data->xpath('//page_group') as $item) {