Replace emarref/jwt with lcobucci/jwt

Refactor all JWT-related components
Replace RS256 with ES256 as a preferred JWT algorithm

api/components/Tokens/AlgorithmIsNotDefinedException.php

@@ -0,0 +1,12 @@
+<?php
+declare(strict_types=1);
+
+namespace api\components\Tokens;
+
+class AlgorithmIsNotDefinedException extends \Exception {
+
+    public function __construct(string $algorithmId) {
+        parent::__construct("Algorithm with id \"{$algorithmId}\" is not defined");
+    }
+
+}