Scripts/BoT: initial work on Theralion and Valiona

Todo:
*Valiona's Deep Breath mechanic and phase switch
*Twilight Realm hostiles
*Heroic abilities

src/server/game/Entities/Object/Object.cpp

@@ -1671,10 +1671,6 @@ void WorldObject::UpdateAllowedPositionZ(float x, float y, float &z) const
                 if (z < ground_z)
                     z = ground_z;
             }
-
-            // Creatures that are simulating flight effects or actual flight should use HoverHeight
-            if ((ToUnit() && (ToUnit()->IsFlying() || ToUnit()->IsHovering() || ToUnit()->IsLevitating())) && !ToUnit()->IsUnderWater())
-                z += GetFloatValue(UNIT_FIELD_HOVERHEIGHT);
             break;
         }
         case TYPEID_PLAYER: