Adding new HAL-accelerated MODE_SGBM_3WAY

New mode is approximately 2-3 times faster than MODE_SGBM
with minimal degradation in quality and uses universal
HAL intrinsics. A performance test was added. The accuracy
test was updated to support the new mode.

modules/calib3d/include/opencv2/calib3d.hpp

@@ -1555,7 +1555,8 @@ public:
     enum
     {
         MODE_SGBM = 0,
-        MODE_HH   = 1
+        MODE_HH   = 1,
+        MODE_SGBM_3WAY = 2
     };
 
     CV_WRAP virtual int getPreFilterCap() const = 0;