feat: Rewrite of the core: avoid globals where possible

Create services for: login, status, router, database, AnonymousStatistics
Drop gesior.backward_support
Drop compat/pages.php
Drop part of compat/classes.php
Move signature to routes

system/settings.php

@@ -213,11 +213,9 @@ return [
 			'default' => 'myaac_',
 		],
 		'backward_support' => [
+			'hidden' => true,
 			'name' => 'Gesior Backward Support',
 			'type' => 'boolean',
-			'desc' => 'gesior backward support (templates & pages)<br/>' .
-						'allows using gesior templates and pages with myaac<br/>' .
-						'might bring some performance when disabled',
 			'default' => true,
 		],
 		'anonymous_usage_statistics' => [