backport 205e13d88: Config: add getPath() (#2758)

Config->getPath() returns the path of the config i.e. the place where the config file is located.

src/pocketmine/utils/Config.php

@@ -248,6 +248,15 @@ class Config{
 		}
 	}
 
+	/**
+	 * Returns the path of the config.
+	 *
+	 * @return string
+	 */
+	public function getPath() : string{
+		return $this->file;
+	}
+
 	/**
 	 * Sets the options for the JSON encoding when saving
 	 *