Add caching to the auto_loader for interfaces (#7320)

* update auto loader to load and cache interfaces

* use new method to update the auto loader cache

* use new interface

* use new interface to trigger a cache flush

* update the console upgrade menu

* update the missing implements syntax

* add the clear_cache to the flush cache button

app/sip_status/cmd.php

@@ -101,6 +101,10 @@
 		case "cache-flush":
 			$cache = new cache;
 			$response = $cache->flush();
+			//trigger clear cache for any classes that require it
+			foreach ($autoload->get_interface_list('clear_cache') as $class) {
+				$class::clear_cache();
+			}
 			message::add($response, 'alert');
 			break;
 		case "reloadxml":