Rework tests structure. Upgrade codeception to 2.5.3. Merge params configuration into app configuration.

api/tests/_pages/MojangApiRoute.php

@@ -0,0 +1,19 @@
+<?php
+namespace api\tests\_pages;
+
+class MojangApiRoute extends BasePage {
+
+    public function usernameToUuid($username, $at = null) {
+        $params = $at === null ? [] : ['at' => $at];
+        $this->getActor()->sendGET("/api/mojang/profiles/{$username}", $params);
+    }
+
+    public function usernamesByUuid($uuid) {
+        $this->getActor()->sendGET("/api/mojang/profiles/{$uuid}/names");
+    }
+
+    public function uuidsByUsernames($uuids) {
+        $this->getActor()->sendPOST('/api/mojang/profiles', $uuids);
+    }
+
+}