OpenGL on Windows is rather unstable and can result in graphical
corruption or the complete inability to start OBS since some GPUs do not
support the minimum requirements after switching to OpenGL. The UI option
is now hidden unless --allow-opengl is passed on the command line.
The D3D adapter is currently unused and we often find users are concerned
when their GPU does not appear in the list.
Instead of checking to see if the window's position is valid, check to
see if the rectangles of the window and the monitor intersect via a
rectangle intersection test.
