vout:win32: add a flag to allow display modules handle the full display size
Right now all Windows display module render on the hvideownd which is already cropped and positioned according to the PlacePicture results. In external rendering we do not have this mechanism and so we need to be able to render on the full display but cropping according to the PlacePicture result. Ultimately that should be the only mode. D3D and OpenGL should have no problem cropping and stretching in the proper area. WinGDI should also be able to only draw on a portion of a HWND. It can already stretch.
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