ATW timing out on vsync and causing black screen about osvr-rendermanager

[russell-taylor]

Unplugging the second display from the system does not make it work again.

When the display is left with an image from the previous run, it goes black when the ATW example app is run, so it is trying to render something, just probably the wrong thing.

[russell-taylor]

Got a crash in RenderManager::RegisterRenderBuffers() --> D3D11ATW::RegisterRenderBuffersInternal() --> RenderManager::LatchRenderInfo() on the m_mutex lock guard.

[russell-taylor]

I had been working on a fix to the registration code that was partly done. The standard code runs okay.

[russell-taylor]

The vsync issue still happens for the stock config file, but this is because it has asynchronous time warp turned off in the config file so we're having problems with the buffers not being locked.