update examples and fix up PCH header

Author: devshgraphicsprogramming

examples_tests

@@ -1,39 +1,19 @@
 // Copyright (C) 2018-2020 - DevSH Graphics Programming Sp. z O.O.
 // This file is part of the "Nabla Engine".
 // For conditions of distribution and use, see copyright notice in nabla.h
-
 #ifndef __NBL_VIDEO_PCH_VIDEO_H_INCLUDED__
 #define __NBL_VIDEO_PCH_VIDEO_H_INCLUDED__
 
+
 #include "nbl/video/declarations.h"
 #include "nbl/video/definitions.h"
 
+
 // private headers
+// TODO: @AnastaZIuk what is this about?
 #ifndef _NBL_PCH_IGNORE_PRIVATE_HEADERS
 
-/* KILL IT
-#include "nbl/video/COpenGLShader.h"
-#include "nbl/video/COpenGLSpecializedShader.h"
-#include "nbl/video/COpenGLBufferView.h"
-#include "nbl/video/COpenGLImage.h"
-#include "nbl/video/COpenGLImageView.h"
-#include "nbl/video/COpenGLSampler.h"
-#include "nbl/video/COpenGLPipelineLayout.h"
-#include "nbl/video/COpenGLRenderpassIndependentPipeline.h"
-#include "nbl/video/COpenGLDescriptorSet.h"
-#include "nbl/video/COpenGLPhysicalDevice.h"
-#include "nbl/video/COpenGLESPhysicalDevice.h"
-#include "nbl/video/COpenGL_LogicalDevice.h"
-#include "nbl/video/COpenGL_Queue.h"
-#include "nbl/video/COpenGLRenderpass.h"
-#include "nbl/video/COpenGLFramebuffer.h"
-#include "nbl/video/COpenGL_Swapchain.h"
-#include "nbl/video/COpenGLCommandBuffer.h"
-#include "nbl/video/COpenGLCommandPool.h"
-#include "nbl/video/COpenGLSemaphore.h"
-#include "nbl/video/COpenGLEvent.h"
-#include "nbl/video/COpenGLFence.h"
-*/
+//
 
 #endif //_NBL_PCH_IGNORE_PRIVATE_HEADERS