Custom internal resolution as in PCSX2

[kirbypuff]

* Wide screen displays (with square pixels) have ~1.7 times less pixels in the Y axis
* Increasing the Y resolution has a higher effect on improving the quality of the details in the distance, while increasing the X resolution has a higher effect on the panorama.
* Eye sensitivity is nonlinear - eyes are more sensitive near the center of the FOV
* Two eyes doesn't mean 2x wider FOV in the X-axis (there's quite a bit of overlap)
* In 1st person and 3rd person 3D games, 'scrolling' is mostly in the Y-axis (the automatic camera almost always centers behind the main character) so higher dynamic resolution in the Y-axis helps more.