Updated video configuration menus

-Remove all modes below 720p or with a 4:3 aspect ratio
-Add adaptive refresh setting
-Changed default to 1280x720
Updates and bugfixes
-Changed defaults
-Fix issue with `vr_hud_transparency`
-Rename enumerator for decoupled aim mode
-Add ability to specify lens separation distance with `vr_ovr_lensdistance`
-Fixed `vr_ovr_distortion`
-updated `vr_ovr_debug` to save value to configuration files
-updated `vr_ovr_debug` to allow changing while running
Added configuration menus
-VR options are under Options->Virtual Reality