576i@50hz support

[matt-comm-link]

Because having an older PAL TV that doesn't support NTSC colour profiles or 60hz signals will forever haunt me.

[h4570]

Yeah this is will be very useful.

At this moment I think that you can experiment resolution in renderer_settings.hpp

or somewhere in renderer_core_gs.cpp

From what I remember, I kinda "hardcoded" this resolution, because it give a lot of space for textures (more than PAL?)