Introduce new DI container

- Adding Friendica\DI class for getting dynamic classes
- Replacing BaseObject::getApp() with this class

src/Module/Home.php

@@ -6,6 +6,7 @@ use Friendica\BaseModule;
 use Friendica\Core\Hook;
 use Friendica\Core\L10n;
 use Friendica\Core\Renderer;
+use Friendica\DI;
 use Friendica\Module\Security\Login;
 
 /**
@@ -15,7 +16,7 @@ class Home extends BaseModule
 {
 	public static function content(array $parameters = [])
 	{
-		$app = self::getApp();
+		$app = DI::app();
 		$config = $app->getConfig();
 
 		// currently no returned data is used