Moved TRPFile construction code from Simulator to Viewer3D.Initialize so that SceneryMaterials dictionary would exist at time of TRPFile instantiation. Packaged TRPFile construction code as TRPFile.CreateTrackProfile.
git-svn-id: http://svn.uktrainsim.com/svn/openrails/trunk@660 a9f3cfff-6c41-7446-b0ca-052bd761e6eb