It is designed for 1D vectors only

don't use legacy test API

Do not try to process empty inputs.

Details 12176

remove from DNN module headers

	* Keep image aspect ratio in resize called in grad_system and
weak_order
	* Bug correction in loop inside Decolor::gradvector

* core(test): merge hang test

* core(merge/split): fix intrin optimization

fixed call open(int id) failed

All vx_call() must be wrapped into own simd128/simd256/simd512 namespace

```
namespace CV__SIMD_NAMESPACE {
... vx_call declaration is here ...
}
```