Core/SmartAI: Allow SMART_ACTION_SET_ACTIVE to take a parameter for on/off (true/false). Required for upcoming EAI to SAI conversion (https://github.com/Discover-/EventAI-to-SmartAI)

src/server/game/AI/SmartScripts/SmartScriptMgr.h

@@ -429,7 +429,7 @@ enum SMART_ACTION
     SMART_ACTION_SET_DATA                           = 45,     // Field, Data (only creature @todo)
     SMART_ACTION_MOVE_FORWARD                       = 46,     // distance
     SMART_ACTION_SET_VISIBILITY                     = 47,     // on/off
-    SMART_ACTION_SET_ACTIVE                         = 48,     // No Params
+    SMART_ACTION_SET_ACTIVE                         = 48,     // on/off
     SMART_ACTION_ATTACK_START                       = 49,     //
     SMART_ACTION_SUMMON_GO                          = 50,     // GameObjectID, DespawnTime in ms,
     SMART_ACTION_KILL_UNIT                          = 51,     //
@@ -726,6 +726,11 @@ struct SmartAction
             uint32 despawnTime;
         } summonGO;
 
+        struct
+         {
+            uint32 state;
+        } active;
+
         struct
         {
             uint32 id;