Port of the liquide crystall I2C lirary found for arduino in rust. Tested on raspberry pi.

Example of use:

```rust use rppal::{gpio::Gpio, i2c::I2c};

static LCD_ADDRESS: u8 = 0x27;

fn setup() {

} fn main() { let mut i2c = I2c::new().unwrap(); let mut delay = rppal::hal::Delay;

let mut lcd = screen::Lcd::new(&mut i2c, LCD_ADDRESS, &mut delay).unwrap();

lcd.set_display(screen::Display::On).unwrap();
lcd.set_backlight(screen::Backlight::On).unwrap();
lcd.print("Hello world!").unwrap();

}

```