Allow linking Points to the reasons they were granted

[davidknoll]

Points (especially with CiviRules) could be created as a result of some other entity, eg a contact's participation in an Activity, Event, Contribution or Membership. The database table for CiviPoints contains entity_table and entity_id columns anticipating this, that are not currently used. This enhancement is to better link points to the reasons they were granted.

Two big parts to this:

• In contacts' points tabs, where a points grant is linked to an entity, display a link to view that entity.
  • Eg. open the event if the points are for participating in an event.
  • And even, show the points linked to an event when looking at the event itself?
• Fill those fields in the points table where appropriate.
  • Eg. in the CiviRules action.
  • Or when doing something with an event or participant, have a button to grant points for it.
  • Or when Actions > Grant Points is clicked, allow selection of the entity to link the points to.