library: replace super::super by crate import

Done with the following shell command:
`sed -e 's/super::super/crate/' -i $(git grep -l super::super)`.

Followed by a `cargo fmt --all`.

src/core/camera.rs

@@ -1,5 +1,5 @@
-use super::super::{Point, Vector};
 use super::film::Film;
+use crate::{Point, Vector};
 
 /// Represent an abstract camera to observe the scene.
 #[derive(Debug, PartialEq)]

src/core/film.rs

@@ -1,4 +1,4 @@
-use super::super::{Point, Vector};
+use crate::{Point, Vector};
 
 /// Represent an abstract camera film, to know where each pixel is in space.
 #[derive(Debug, PartialEq)]

src/light/ambient_light.rs

@@ -1,6 +1,6 @@
-use super::super::core::LinearColor;
-use super::super::Point;
 use super::Light;
+use crate::core::LinearColor;
+use crate::Point;
 
 /// Represent an ambient lighting which is equal in all points of the scene.
 #[derive(Debug, PartialEq)]

src/light/directional_light.rs

@@ -1,6 +1,6 @@
-use super::super::core::LinearColor;
-use super::super::{Point, Vector};
 use super::{Light, SpatialLight};
+use crate::core::LinearColor;
+use crate::{Point, Vector};
 
 /// Represent a light emanating from a far away source, with parallel rays on all points.
 #[derive(Debug, PartialEq)]

src/light/point_light.rs

@@ -1,6 +1,6 @@
-use super::super::core::LinearColor;
-use super::super::{Point, Vector};
 use super::{Light, SpatialLight};
+use crate::core::LinearColor;
+use crate::{Point, Vector};
 
 /// Represent a light emanating from a point in space, following the square distance law.
 #[derive(Debug, PartialEq)]

src/light/spot_light.rs

@@ -1,6 +1,6 @@
-use super::super::core::LinearColor;
-use super::super::{Point, Vector};
 use super::{Light, SpatialLight};
+use crate::core::LinearColor;
+use crate::{Point, Vector};
 
 /// Represent a light emanating from a directed light-source, outputting rays in a cone.
 /// The illumination cone cannot have an FOV over 180°.

src/material/uniform.rs

@@ -1,6 +1,6 @@
-use super::super::core::color::LinearColor;
-use super::super::Point2D;
 use super::Material;
+use crate::core::color::LinearColor;
+use crate::Point2D;
 
 /// A material with the same characteristics on all points.
 #[derive(Debug, PartialEq)]

src/render/object.rs

@@ -1,6 +1,6 @@
-use super::super::material::Material;
+use crate::material::Material;
-use super::super::shape::Shape;
+use crate::shape::Shape;
-use super::super::texture::Texture;
+use crate::texture::Texture;
 
 /// An object being rendered in the scene.
 #[derive(Debug)]

src/shape/sphere.rs

@@ -1,5 +1,5 @@
-use super::super::{Point, Point2D, Vector};
 use super::Shape;
+use crate::{Point, Point2D, Vector};
 use bvh::aabb::{Bounded, AABB};
 use bvh::ray::Ray;
 

src/shape/triangle.rs

@@ -1,5 +1,5 @@
-use super::super::{Point, Point2D, Vector};
 use super::Shape;
+use crate::{Point, Point2D, Vector};
 use bvh::aabb::{Bounded, AABB};
 use bvh::ray::Ray;
 

src/texture/uniform.rs

@@ -1,6 +1,6 @@
-use super::super::core::LinearColor;
-use super::super::Point2D;
 use super::Texture;
+use crate::core::LinearColor;
+use crate::Point2D;
 
 /// A texture with the same color on all points.
 #[derive(Debug, PartialEq)]