Improve "Indicators" tooltips

[skulldir]

Many of the indictors are self explanatory, but initially I dont understand the exact purpose of the following:
Raid Icon (Target) - I assume this is the raid icon of the target of the person who's frame you are looking at, but I have never seen this before so I am not sure
Aggro Blink/Bar: What is the difference between these (does the blink for a fixed amount of time after getting aggro)
Aoe Healing: I dont know what this does, I assume this is an indicator if some of your aoe healing spells are active on this player (for example wild growth active on that particular player)

[skulldir]

It is also not clear to me what "NPC" or "Spotlight" means under the layout tab so having a tooltip of what these mean would also be nice.

[enderneko]

will do something about "AoE Healing" indicator in the future.