now create window only once per test case

* added Access parameter to GlBuffer::mapHost
* added autoRelease parameter to all create methods
* fixed indentation in gl_core_3_1
* minor improvments for opengl sample

* removed OpenGLFuncTab, now extensions are loaded internally
* renamed GlTexture -> GlTexture2D
* added support of GlBuffer and GlTexture2D to InputArray/OutputArray
* added ELEMENT_ARRAY_BUFFER and PIXEL_PACK_BUFFER targets
* added copyFrom/copyTo method for GlBuffer and GlTexture2D
* removed GlFont
* removed pointCloudShow
* removed OpenGLCleanCallback

ensureSizeIsEnough now doesn't reallocate memory, if buffer is small submat of big matrix
fixed createContinous according new changes

There was missing windows.h include in OpenGL interop code.

This fixes output for 8U and 8S vector depths.
They were mistakenly printed as characters instead of numbers.

* typo in Algorithm::addParam for 'short' data type which results in segmentation fault on ARM
  on attempt to set type property for FAST using setter inherited from Algorithm
* added short type support to read/write methods
* improved some error messages

made it to give more verbose errors when arguments of wrong types are passed, added setters with types (e.g. setInt, etc)

After setting depth to CV_32F for non double types this produces difference in results. I've attached test that reproduce this issue.The issue was found during anali broken GPU tests  for multiply/device functions.

Add output stream operators (<<) for Rect, Size, Matx, Vec.
I can't add operations for cv::KeyPoint.

And putting together all operator<<.
(Matx, Point_, Point3_, Vec, Size_, Rect_)

This fixes build without TBB and CUDA. Issue #2445

All errors were found by doc/check_docs2.py