Updated to Oculus 0.3.2 SDK

* removed oculus distortion shader, now the SDK will render this for us.
* swizzled joystick axes for SDL2.
* mintty/win.cpp: fixed memory corruption when generating ANSI colors.
* render.cpp: renamed RenderFullScreenQuad to RenderScreenAlignedQuad
  and made it support non-full screen quads.
* riffty.cpp: units are now in meters instead of cm
* riftty.cpp: lots or rendering re-work to support new ovr sdk.
* riftty.cpp: text rendering is disabled due to bugs.
* riftty.cpp: updated Shader::apply to disable all vert attrib arrays
  on initial render.