Set signal default flash rate to 1s on/1s off.
Update signal shape code to apply the simulation signal state for all signal types.
Update signal shape code to respect flash on/off times.
Fix all materials to reset RenderState to defaults in ResetState().
Add #define for checking materials reset RenderState correctly.
Fix alpha tested materials to not be marked as blended (since they're not).
git-svn-id: http://svn.uktrainsim.com/svn/openrails/trunk@383 a9f3cfff-6c41-7446-b0ca-052bd761e6eb