Merge branch 'master' into viewport

# Conflicts:
#	examples/imgui_impl_dx10.cpp
#	examples/opengl2_example/imgui_impl_glfw_gl2.cpp
#	examples/opengl3_example/imgui_impl_glfw_gl3.cpp
#	examples/vulkan_example/main.cpp
#	imgui.h

examples/directx9_example/main.cpp

@@ -192,6 +192,7 @@ int main(int, char**)
 
     if (g_pd3dDevice) g_pd3dDevice->Release();
     if (pD3D) pD3D->Release();
+    DestroyWindow(hwnd);
     UnregisterClass(_T("ImGui Example"), wc.hInstance);
 
     return 0;