some functions had vague names, I even ended up re-writing some of these functions by accident! also added doxy comments. * ED_view3d_win_to_3d (was window_to_3d) * ED_view3d_win_to_delta (was window_to_3d_delta) * ED_view3d_win_to_vector (was window_to_3d_vector / viewvector) * ED_view3d_win_to_segment_clip (was viewline) * ED_view3d_win_to_ray (was viewray)