Add an option to disable clut/render-to-self/etc.

Some people with slower devices would prefer the higher render resolution with major graphical glitches, it seems like.  This isn't a very difficult option to add, and in some games the improper effects are probably tolerable.

-[Unknown]
Maybe only on really weak mobiles.

I guess on the weakest mobiles you want to use non-buffered rendering anyway as that will be even faster and break even more effects, heh.