Introduce new DI container

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

src/Module/WellKnown/HostMeta.php

@@ -4,6 +4,7 @@ namespace Friendica\Module\WellKnown;
 
 use Friendica\BaseModule;
 use Friendica\Core\Renderer;
+use Friendica\DI;
 use Friendica\Protocol\Salmon;
 use Friendica\Util\Crypto;
 
@@ -15,7 +16,7 @@ class HostMeta extends BaseModule
 {
 	public static function rawContent(array $parameters = [])
 	{
-		$app = self::getApp();
+		$app = DI::app();
 		$config = $app->getConfig();
 
 		header('Content-type: text/xml');

src/Module/WellKnown/NodeInfo.php

@@ -4,6 +4,7 @@ namespace Friendica\Module\WellKnown;
 
 use Friendica\App;
 use Friendica\BaseModule;
+use Friendica\DI;
 
 /**
  * Standardized way of exposing metadata about a server running one of the distributed social networks.
@@ -13,7 +14,7 @@ class NodeInfo extends BaseModule
 {
 	public static function rawContent(array $parameters = [])
 	{
-		$app = self::getApp();
+		$app = DI::app();
 
 		self::printWellKnown($app);
 	}

src/Module/WellKnown/XSocialRelay.php

@@ -3,6 +3,7 @@
 namespace Friendica\Module\WellKnown;
 
 use Friendica\BaseModule;
+use Friendica\DI;
 use Friendica\Model\Search;
 
 /**
@@ -13,7 +14,7 @@ class XSocialRelay extends BaseModule
 {
 	public static function rawContent(array $parameters = [])
 	{
-		$app = self::getApp();
+		$app = DI::app();
 		$config = $app->getConfig();
 
 		$subscribe = $config->get('system', 'relay_subscribe', false);