fully implemented SSE and NEON cases of intrin.hpp; extended the HAL with some basic math functions

modules/photo/src/arrays.hpp

@@ -44,6 +44,9 @@
 #ifndef __OPENCV_DENOISING_ARRAYS_HPP__
 #define __OPENCV_DENOISING_ARRAYS_HPP__
 
+namespace cv
+{
+
 template <class T>
 struct Array2d
 {
@@ -176,4 +179,6 @@ struct Array4d
     }
 };
 
+}
+
 #endif