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sprite sheet capability

Hi, your library is indeed simple and lacks an important simple feature, being able to draw a rectangle portion of an image.
Your draw_image code seems to allow setting the (x,y) of the rendering rectangle, but not the (w,h).
I thought (SDL2 canvas)[https://docs.rs/sdl2/0.34.5/sdl2/render/struct.Canvas.html#method.copy] went more like:

// the frame of the image on the sprite sheet
let frame = Rect {
    x:64,
    y:0,
    w:64,
    h:64,
};
// the screen size
let (width, height) = canvas.output_size()?
let screen_rectangle = Rect {
    x:0,
    y:0,
    w:width,
    h:height,
};
canvas.copy(&texture, frame, screen_rectangle);

However in your (code)[https://github.com/alexandercampbell/simple/blob/master/src/window.rs#L224] is looks like

// copy the texture onto the drawer()
self.canvas
     .copy(
         &(image.texture),
         Some(shape::Rect::new(
// I think this is not what you intend to do
              x,
              y,
// this should be editable
              image.get_width() as u32,
              image.get_height() as u32,
          )),
// this should be different I think
          None,
      )
     .unwrap();

Text Drawing Support

This library needs support for text drawing functions.

// use the default font
app.print("Monday", 32, 96);

// load a different font
let font = simple::Font::from_file(Path::new("my_font.ttf"));
app.set_font(font);
app.print("Monday", 64, 96);

// Wrap text inside of a rect.
// this will probably end up looking like
//
//  Monday is my
//  favorite day
//  of the entire
//  week!
//
app.print_rect("Monday is my favorite day of the entire week!", simple::Rect{
    x: 96,
    y: 96,
    w: 128,
    h: 512,
})