Extend set of samples (#296)

+ 12_InitFrameBuffers, 13_InitVertexBuffer, 14_InitPipeline, 15_DrawCube;
+ extend utilities and add utilities on geometries, math, and shaders
+ slightly adjust some other samples

samples/10_InitRenderPass/10_InitRenderPass.cpp

@@ -51,7 +51,7 @@ int main(int /*argc*/, char * /*argv[]*/)
     vk::UniqueDevice device = vk::su::createDevice(physicalDevices[0], graphicsAndPresentQueueFamilyIndex.first, vk::su::getDeviceExtensions());
 
     vk::Format colorFormat = vk::su::pickColorFormat(physicalDevices[0].getSurfaceFormatsKHR(surface.get()));
-    const vk::Format depthFormat = vk::Format::eD16Unorm;
+    vk::Format depthFormat = vk::Format::eD16Unorm;
 
     /* VULKAN_HPP_KEY_START */
 
@@ -71,6 +71,12 @@ int main(int /*argc*/, char * /*argv[]*/)
     // functions are called by the destructor of the UniqueRenderPass and the UniqueSemaphore on leaving this scope.
 
     /* VULKAN_HPP_KEY_END */
+
+#if defined(VK_USE_PLATFORM_WIN32_KHR)
+    DestroyWindow(window);
+#else
+#pragma error "unhandled platform"
+#endif
   }
   catch (vk::SystemError err)
   {