move to psr-4 autoloader

include/autoload.php

@@ -1,17 +1,2 @@
 <?php
-	spl_autoload_register(function($class) {
-
-		$root_dir = dirname(__DIR__); // we were in tt-rss/include
-
-		// - internal tt-rss classes are loaded from classes/ and use special naming logic instead of namespaces
-		// - plugin classes are loaded by PluginHandler from plugins.local/ and plugins/
-
-		$class_file = "$root_dir/classes/" . str_replace("_", "/", strtolower($class)) . ".php";
-
-		if (file_exists($class_file))
-			include $class_file;
-
-	});
-
-	// also pull composer autoloader
 	require_once "vendor/autoload.php";