Adding support for WinRT(WinPhone 8/8.1 and Win Store) via CMake 3.1

- Substituted HAVE_WINRT with WINRT
- Fixed compilation issues in ocl.cpp and parallel.cpp
- Fixed compiler issue for WP8: "C2678: binary '+' : no operator found which takes a left-hand - Fixed gitignore
- Added #ifdef HAVE_OPENCL to remove compiler warnings in ocl.cpp
- Used NO_GETENV similar to '3rdparty\libjpeg\jmemmgr.c;
- Added ole32.lib for core module (for WindowsStore 8.0 builds)
- Made OpenCV_ARCH aware of ARM

Signed-off-by: Maxim Kostin <v-maxkos@microsoft.com>

modules/python/CMakeLists.txt

@@ -9,7 +9,7 @@ if((WIN32 AND CMAKE_BUILD_TYPE STREQUAL "Debug")
   ocv_module_disable(python3)
 endif()
 
-if(ANDROID OR IOS)
+if(ANDROID OR IOS OR WINRT)
   ocv_module_disable(python2)
   ocv_module_disable(python3)
 endif()