Support setting any Viewer3D bool/int setting from the command-line.
Add Profiling and VerticalSync bool settings to Viewer3D.
Add /skip-user-settings command-line argument which avoids loading user's OR config from the registry.
git-svn-id: http://svn.uktrainsim.com/svn/openrails/trunk@314 a9f3cfff-6c41-7446-b0ca-052bd761e6eb