Stash TriggerData primary entity type in setEntityData()

ufundorequested to merge
ufundo/civirules:triggerdata-entity into master

Trying to move towards more consolidated implementation for getEntity() in the base class CRM_Civirules_TriggerData_TriggerData in a way that wouldn't break anything, but would allow simplifying the derived classes.

Edited by ufundo

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