Use value of 1 when upscale multiplier is 0 for ScalingFactor, this is
to avoid doing math with 0 in shader.
It helps custom res be less broken. Still not recommended to use custom
res ofc.
Remove GSCrc.h include in GSRendererHW and GSRendererDX11, file is
already included in GSState.h.
Remove GSRenderer.h include from renderers except Null and CL, file already
included in TextureCache hw/sw.
Remove resource.h include from GSRendererDX11, already included in GSDevice11.
Remove GSOsdManager.h from GSDeviceOGL, already included in GSDevice
This pull request is for the pending reorganization of the folder structure on GSdx,
making it better organized and easier to work with.
Also remove unused GSTextureFX.cpp file.
Gregory Hainaut