Introduce "static/env.config.php" for environment variable mapping to config cache entries

- Added new database.port config value (used for MYSQL_PORT)
- Removed now obsolete db environment variable functionality
- Added functionality to load env variables (overwrites DB based cached)

src/Database/Database.php

@@ -66,7 +66,7 @@ class Database
 	protected $testmode       = false;
 	private $relation       = [];
 
-	public function __construct(Cache $configCache, Profiler $profiler, LoggerInterface $logger, array $server = [])
+	public function __construct(Cache $configCache, Profiler $profiler, LoggerInterface $logger)
 	{
 		// We are storing these values for being able to perform a reconnect
 		$this->configCache   = $configCache;