DBM_TimerStart -- > DBM_TimerBegin

Start is deprecated and begin is rework that weak aura requested. Currently DBM still sends both but it won't send Start next major patch.

Also just added DBM_EnemyEngaged

DBM:FireEvent("DBM_EnemyEngaged", guid, cid, delay, unitID)

delay is approx time since last scan which is between 0.1-0.5 depending on condition of scan trigger. just reflects variance/latency of combat pickup.