Extend functionality, close button and table view sections

Sections can be created, 2 new methods created for this. 

```
prefs.init("Settings");

	prefs.addSection({
		title: "Section"
	});

prefs.addSwitch({
		id: "SAVE_ON_QUIT",
		caption: "Alarm"
	});

prefs.addSection({
		title: "T10 Accounts"
	});

	prefs.addTextInput({
		id: "USERNAME",
		caption: "username",
		value: "Anonymous"
	});

prefs.closeSection();

	prefs.open();
```

Example of how it works, you must call closeSection(); before opening.