Some improvements

- Move $_SERVER into ConfigFileManager constructor
- Rename "creatConfigFileLoader" to "createConfigFileManager"
- Rename variable "loader" to "manager" in all tests

tests/src/Core/Config/ConfigTest.php

@@ -76,7 +76,7 @@ class ConfigTest extends MockedTest
 	 */
 	public function getInstance()
 	{
-		$this->configFileManager->setupCache($this->configCache, []);
+		$this->configFileManager->setupCache($this->configCache);
 		return new Config($this->configFileManager, $this->configCache);
 	}