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/Factory/ConfigFactory.php

@@ -37,10 +37,10 @@ class ConfigFactory
 	 *
 	 * @throws Exception
 	 */
-	public function createCache(ConfigFileLoader $loader)
+	public function createCache(ConfigFileLoader $loader, array $server = [])
 	{
 		$configCache = new Cache();
-		$loader->setupCache($configCache);
+		$loader->setupCache($configCache, $server);
 
 		return $configCache;
 	}