Rename `Orthographic3::unwrap` to `Orthographic3::into_inner` and deprecate `Orthographic3::unwrap`

See #460

src/base/cg.rs

@@ -115,7 +115,7 @@ impl<N: Real> Matrix4<N> {
     /// Creates a new homogeneous matrix for an orthographic projection.
     #[inline]
     pub fn new_orthographic(left: N, right: N, bottom: N, top: N, znear: N, zfar: N) -> Self {
-        Orthographic3::new(left, right, bottom, top, znear, zfar).unwrap()
+        Orthographic3::new(left, right, bottom, top, znear, zfar).into_inner()
     }
 
     /// Creates a new homogeneous matrix for a perspective projection.

src/geometry/orthographic.rs

@@ -280,9 +280,17 @@ impl<N: Real> Orthographic3<N> {
     ///     0.0,       0.0,       -2.0 / 999.9, -1000.1 / 999.9,
     ///     0.0,       0.0,        0.0,         1.0
     /// );
-    /// assert_eq!(proj.unwrap(), expected);
+    /// assert_eq!(proj.into_inner(), expected);
     /// ```
     #[inline]
+    pub fn into_inner(self) -> Matrix4<N> {
+        self.matrix
+    }
+
+    /// Retrieves the underlying homogeneous matrix.
+    /// Deprecated: Use [Orthographic3::into_inner] instead.
+    #[deprecated(note="use `.into_inner()` instead")]
+    #[inline]
     pub fn unwrap(self) -> Matrix4<N> {
         self.matrix
     }
@@ -725,6 +733,6 @@ where Matrix4<N>: Send
 impl<N: Real> From<Orthographic3<N>> for Matrix4<N> {
     #[inline]
     fn from(orth: Orthographic3<N>) -> Self {
-        orth.unwrap()
+        orth.into_inner()
     }
 }

tests/geometry/projection.rs

@@ -15,7 +15,7 @@ fn orthographic_inverse() {
     let proj = Orthographic3::new(1.0, 2.0, -3.0, -2.5, 10.0, 900.0);
     let inv = proj.inverse();
 
-    let id = inv * proj.unwrap();
+    let id = inv * proj.into_inner();
 
     assert!(id.is_identity(1.0e-7));
 }