Add support for dss_write.
Enable writing in depth buffer for dss_write,
when depth conversion is active data will be writen in the depth buffer,
if not then use the old method (don't write).
Always enable unscale point and line hack on upscaled resolutions, and
purge the gui option.
It was discussed in the past with Gregoy that it can be enabled without
causing any issues which will be beneficial to getting rid of 1 less
option and fixing a bunch of fmv issues without relying on a gui toggle.
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.
Kojin