Improvements to SAO

Lotsa minor changes but the quality is great now :

. It now scales properly the depth texture for games like Dark Souls2 or RE Revelations for 16/10 users (isAspectRatioFixNeeded flag)
. The depth & ssao processing can be 1/2 scaled by the ssaoScale parameter in GeDoSaTo.ini
. Added a lot of comments to the SAO.fx shader itself and made some more settings configurable. I think it should be pretty readable even for non-hardcore users
. Mirror Edge and FFXIV still refuse to work with an injected depthstencil texture unfortunately. DeusEx HR -god I really wanted that one  to work but oh well- and FarCry 2 apparently have rendering issues with SSAO enabled (even if the SSAO works itself) but apart from that I'd say 8 out of 10 games work absolutely fine with injected SSAO, at least for me on a AMD card