Move Array trait to separate file

Also remove the ::new() method on the trait

src/array.rs

@@ -0,0 +1,39 @@
+
+/// Trait for fixed size arrays.
+pub unsafe trait Array {
+    /// The array's element type
+    type Item;
+    #[doc(hidden)]
+    fn as_ptr(&self) -> *const Self::Item;
+    #[doc(hidden)]
+    fn as_mut_ptr(&mut self) -> *mut Self::Item;
+    #[doc(hidden)]
+    fn capacity() -> usize;
+}
+
+macro_rules! fix_array_impl {
+    ($len:expr ) => (
+        unsafe impl<T> Array for [T; $len] {
+            type Item = T;
+            #[inline(always)]
+            fn as_ptr(&self) -> *const T { self as *const _ as *const _ }
+            #[inline(always)]
+            fn as_mut_ptr(&mut self) -> *mut T { self as *mut _ as *mut _}
+            #[inline(always)]
+            fn capacity() -> usize { $len }
+        }
+    )
+}
+
+macro_rules! fix_array_impl_recursive {
+    () => ();
+    ($len:expr, $($more:expr,)*) => (
+        fix_array_impl!($len);
+        fix_array_impl_recursive!($($more,)*);
+    );
+}
+
+fix_array_impl_recursive!(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+                          16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
+                          32, 40, 48, 56, 64, 72, 96, 128, 160, 192, 224,);
+