Get UI Theme variables via hooks (instead of withStyles())

[dandevs]

Issue type

I'm submitting a ... (check one with "x")

• bug report
• feature request

Issue description

Request in title, I believe it'd be much simpler to use a hook over the current withStyles() method

Related code:

const Component = () => {
  const theme = useKittenTheme();
  const primary = theme["color-success-200"];

  // Or something like
  const styles = useKittenTheme(theme => ({
    layout: {
      backgroundColor: theme["color-success-200"]
    }
  });

  <Layout style={styles.layout}/>;
  return <Layout style={{backgroundColor: primary}>...</Layout>;
}

Other information:

**OS, device, application version **

UI Kitten 4.3.1

[dandevs]

Sorry, wrong repo 🔢 👎 🥇