platform: clean up main.rs and split out hardware specific bits to platform module

src/smart_leds_lib.rs

@@ -76,7 +76,7 @@ impl<T: SmartLedsWrite<Color = Rgb<u8>>, S: Surface> Display<S> for SmartLedDisp
     }
 
     fn render_frame(&mut self) {
-        for x in (0..self.pixbuf.len()) {
+        for x in 0..self.pixbuf.len() {
             let virtCoords = VirtualCoordinates::new(x as u8, 0);
             let mut pixel = RGB8::new(0, 0, 0);
             for surface in self.surfaces.iter() {