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/JsonRpcRequest.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace SparkPlug\Com\Noccy\ApiClient\Request;
+
+use GuzzleHttp\Psr7\Response;
+
+class JsonRpcRequest extends Request
+{
+
+    public function getInfo(): array
+    {
+        return [
+        ];
+    }
+
+    public function send(): ?Response
+    {
+        return null;
+    }
+
+    public function getHeaders(): array
+    {
+        return [];
+    }
+
+}