changes to TokenStream in order to be const-correct
changes to TokenStream in order to be const-correct

schancel/SDC,deadalnix/SDC,deadalnix/SDC,DmitryOlshansky/SDC,bpr/SDC,sidmutha/SDC,bpr/SDC,SDC-Developers/SDC,schancel/SDC,UplinkCoder/SDC,JohanEngelen/SDC,JohanEngelen/SDC,sidmutha/SDC,JohanEngelen/SDC,UplinkCoder/SDC,DmitryOlshansky/SDC,UplinkCoder/SDC,bpr/SDC,SDC-Developers/SDC,schancel/SDC,DmitryOlshansky/SDC,sidmutha/SDC,SDC-Developers/SDC,deadalnix/SDC