multiview: Add option to choose parallel or cross-eyed viewing method for side-by-side display
Merge pull request #31 from Alexey-Akishin/sidebyside

multiview: Add option to choose parallel or cross-eyed viewing method for side-by-side display

Things to be fixed in a future commit:

""""
-  {0, "PARALLEL", 0, "Parallel", "Left eye should see left image and vice-versa"},
+ {USER_SIDEBYSIDE_PARALLEL, "PARALLEL", 0, "Parallel", "Left eye should see left image and vice-versa"},
Also I think we either name those defines "STEREO_SIDEBYSIDE_PARALLEL", or USER_STEREO_SIDEBYSIDE_PARALLEL.
I think STEREO is more important than USER in this case.

Another thing, bool cross_eyed =... can be outside the for loop
"""