* Update OpenVR from an unknown version to 1.1.3b
There shouldn't be any breaking changes.
* Add removed variables from old OpenVR version
The strings are the names of variables in steamvr.vrsettings in
C:\Program Files
(x86)\Steam\steamapps\common\SteamVR\resources\settings\
The string allowReprojection leads to warning log spam on some
occasions.
For more information see this github issue
https://github.com/OpenVR-Advanced-Settings/OpenVR-AdvancedSettings/issues/25.