remove a lot of stuff from global context (functions.php), add a few helper classes instead

plugins/no_iframes/init.php

@@ -23,7 +23,7 @@ class No_Iframes extends Plugin {
 		$entries = $xpath->query('//iframe');
 
 		foreach ($entries as $entry) {
-			if (!iframe_whitelisted($entry))
+			if (!Sanitizer::iframe_whitelisted($entry))
 				$entry->parentNode->removeChild($entry);
 		}
 
@@ -34,4 +34,4 @@ class No_Iframes extends Plugin {
 		return 2;
 	}
 
-}
+}