Resolve "Remove all use of GLOBALS"

Closes #13

classes/Configuration.php

+<?php declare(strict_types=1);
+
+namespace uib\ub\loadspeakr;
+
+final class Configuration
+{
+    private array $configs;
+
+    /**
+     * @throws \Exception
+     */
+    public function __construct(array $conf)
+    {
+        if (count($conf) === 0) {
+            throw new \Exception(
+              'Configuration empty. Giving up.'
+            );
+        }
+
+        $this->configs['conf'] = $conf;
+    }
+
+    public function getConfigValue(string $type, string $key)
+    {
+        if (!isset($this->configs[$type][$key])) {
+            return '';
+        }
+
+        return $this->configs[$type][$key];
+    }
+
+    public function debugMode(): bool
+    {
+        return $this->configs['conf']['debug'];
+    }
+
+}