Prevent the render window from spawning off screen.

Fixes issue 6063.
Fixed the Windows 32bit debug build.
Actually set the bIDIVa value in the ARM CPUDetect.
Beginning of VFP cleanup. Will finish when I have the hardware in front of me.
VideoSoftware: Do not clear the depth buffer on EFB copy clears when depth writing is disabled.
PixelShaderGen: Force depth textures to be emulated when the result is needed for fog calculation.