Update OpenVR dependency to version 1.1.3b (#28)

* 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.

src/tabcontrollers/SteamVRTabController.cpp

@@ -7,6 +7,16 @@ namespace vr
 // this was removed from openvr_api.h in 1.0.8
 static const char* const k_pch_SteamVR_RenderTargetMultiplier_Float
     = "renderTargetMultiplier";
+
+// This was removed when updating from an unknown version to OpenVR
+// version 1.1.3. This should probably be removed along with any features
+// connected to it. Valve probably removed it for a reason.
+static const char* const k_pch_SteamVR_AllowAsyncReprojection_Bool
+    = "allowAsyncReprojection";
+static const char* const k_pch_SteamVR_AllowReprojection_Bool
+    = "allowInterleavedReprojection";
+static const char* const k_pch_SteamVR_ForceReprojection_Bool
+    = "forceReprojection";
 } // namespace vr
 
 // application namespace