add IRT geometry to RICH cpp files

One method for connecting irt and athena is to create irt objects in the athena RICH .cpp files. This is an alternative to using GeoSvc in Juggler, however the proposed method introduces a dependency on irt to athena. We ran using this method in the branch irt-init-v01 for the proposal. Whether this method or the GeoSvc method is preferred remains to be discussed, but a useful first step would be to rebase the irt-init-v01 branch.