For now, don't build shaders if using the GL renderer.
Remove TestBull entity from Empty example game.
Use platform specific native window handles in OIS::Initialize().
For now, don't build fonts if using the GL renderer.
Fix comments.
Implement GLImmediateCommandProxy::SetDepthStencilState.
Implement render-to-texture in GL.
Implement SetViewport.
Implement GLImmediateCommandProxy::SetRasterizerState.
Implement GLImmediateCommandProxy::SetBlendState.
Comment out the application of GL renderer Constant Buffers / Uniform Buffer Objects, since we don't even compile shaders for GL yet.
Implement GLImmediateCommandProxy::SetSamplerStates.
Don't create full-screen quad in GL version of GraphicsScene.
Comment out GLImmediateCommandProxy::UnbindResources in GL renderer for now.