Scripts/Instances: Complete rewrite of the boundary system.

- Migrate boundary logic to Maps/AreaBoundary instead of having it sit in InstanceScript (to possibly allow use for other purposes).
- Implement the first five boundary types in Maps/AreaBoundary.cpp.
- Add boundary checks to Creature's update logic
- Add boundary data for all Northrend raids
- Add boundary initialization structures and methods to InstanceScript
- Modify EnterEvadeMode signature. It now passes a value from the EvadeReason enum as parameter to allow special casing depending on evade reason
- Remove previous (weird) boundary code that had them linked to GO spawns

src/server/game/AI/SmartScripts/SmartAI.cpp

@@ -408,7 +408,7 @@ void SmartAI::MovementInform(uint32 MovementType, uint32 Data)
     MovepointReached(Data);
 }
 
-void SmartAI::EnterEvadeMode()
+void SmartAI::EnterEvadeMode(EvadeReason /*why*/)
 {
     if (!me->IsAlive() || me->IsInEvadeMode())
         return;