Introduce new DI container

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

src/Module/Apps.php

@@ -7,6 +7,7 @@ use Friendica\Content\Nav;
 use Friendica\Core\Config;
 use Friendica\Core\L10n;
 use Friendica\Core\Renderer;
+use Friendica\DI;
 
 /**
  * Shows the App menu
@@ -17,7 +18,7 @@ class Apps extends BaseModule
 	{
 		$privateaddons = Config::get('config', 'private_addons');
 		if ($privateaddons === "1" && !local_user()) {
-			self::getApp()->internalRedirect();
+			DI::app()->internalRedirect();
 		}
 	}