config-files: Move all the configuration files into config folder. (#508)

This commit moves all the configuration(.json) files into a config folder
if the config folder doesn't already exist. It also updates the places
where these files are being accessed with the new address.
This will help us zip the folder easily in the future.

app/main/index.js

@@ -54,7 +54,8 @@ function createMainWindow() {
 	// Load the previous state with fallback to defaults
 	const mainWindowState = windowStateKeeper({
 		defaultWidth: 1100,
-		defaultHeight: 720
+		defaultHeight: 720,
+		path: `${app.getPath('userData')}/config`
 	});
 
 	// Let's keep the window position global so that we can access it in other process