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();
}

```