Adding of destructor and placement new constructors for classes wrapped with CV_EXPORTS_W_SIMPLE macro

The TiffDecoder keeps an open file handle.
As a consequence the file cannot be removed
before the TiffDecoder closes the file.

* example using the Canny algorithm with custom image gradient.

* Modified example to integrate new function canny with custom gradient

      * accumulate, accumulateSquare, accumulateProduct and accumulateWeighted

Exp and Log IPP implementations are changed to hal interface;

consequences of changes

accuracy test

Solve issue 7063

  * The difference becomes too large when multiply is done in int16
  * To reproduce the test failure, IPP has to be switched off