make timeline feature toggleable
make timeline feature toggleable

nulib/avalon,avalonmediasystem/avalon,ualbertalib/avalon,nulib/avalon,avalonmediasystem/avalon,nulib/avalon,avalonmediasystem/avalon,uvalib/avalon,ualbertalib/avalon,uvalib/avalon,avalonmediasystem/avalon,uvalib/avalon,uvalib/avalon,nulib/avalon,ualbertalib/avalon,ualbertalib/avalon