Multiple fixes

* Implemented ScriptRunner with environment expansion and cleaner
  code.
* Added ApiClient plugin (com.noccy.apiclient)
* Renamed CHANGELOG.md to VERSIONS.md
* Shuffled buildtools
* Added first unittests

plugins/com.noccy.apiclient/Request/Request.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace SparkPlug\Com\Noccy\ApiClient\Request;
+
+use GuzzleHttp\Psr7\Response;
+
+abstract class Request
+{
+
+    abstract public function send(): ?Response;
+
+    abstract public function getInfo(): array;
+
+    abstract public function getHeaders(): array;
+
+}