WinRT and DirectX versions of Cinder

This pull request contains the necessary changes to get Cinder building for WinRT and Windows Store Apps.. Both Win32 and ARM builds are supported.

Changes were also made to provide native DirectX support for Cinder Win32 Desktop apps. Cinder now supports DirectX in WinRT and Win32 Desktop app and OpenGL in Win32 Desktop apps.

VC11 project to build for winrt is in Cinder/winrt
VC11 project to buildWin32  DirectX Desktop version of Cinder is in Cinder/vc11-DirectX
VC11 project to build original Win32 OpenGL version of Cinder is in Cinder/vc11

WinRT and DirectX sample apps are in:

Cinder/samples/basicApp
Cinder/samples/ImageFileBasic
Cinder/samples/MultiTouchBasic
Cinder/samples/DirectX/ various demos (some may still be in progress)