TRestSignalEventViewer replaced by TRestRawToSignalProcess. Now is more generic and draw all types of event via TRestEvent->Draw(). Adding function SetEvent to TRestEventViewer in order to cast the event type. TRestReadoutEventViewer and REST_VIEWER_SignalEvent has been changed in accordance


Former-commit-id: 9901e44be785396753373318b52d9a058ac26f37