Add Two.Text.direction property

[jonobr1]

This PR introduces text direction to the Two.Text class. Now, you can specify if text is rendered from left to right or right to left. This is helpful for working with more languages, such as:

• Arabic
• Aramaic
• Azeri
• Dhivehi/Maldivian
• Hebrew
• Kurdish (Sorani)
• Persian/Farsi
• Urdu

Example usage:

const str = "تا زمانی که متوقف نشوید، مهم نیست که چقدر آهسته حرکت می کنید.";
const text = new Two.Text(str, two.width - 10, 50);
text.direction = 'rtl'; // Default is 'ltr'