Fix play / stop handlers
Fix play / stop handlers

concord-consortium/jsmol-models,concord-consortium/jsmol-models,rishiloyola/jsmol-models,rishiloyola/jsmol-models,rishiloyola/jsmol-models,concord-consortium/jsmol-models,rishiloyola/jsmol-models,concord-consortium/jsmol-models,concord-consortium/jsmol-models