Emulator

Currently efb copy can be set to texture or to ram. The efb to ram option is actually a hybrid approach that stores an efb copy as a fbo in system ram and another copy as a texture in video ram. Due to the recent efb to ram caching option which improves performance but requires accurate texture cache to be on to avoid corruption of the efb texture copy it would now be beneficial to rename the "ram" option to "hybrid" and add a real ram option that does not store an efb texture copy.

I am hereby reminding neobrain to do this since he expressed interest in it.