UPBGE: Use aligned allocator for RAS_BoundingBox::DisplayArraySlot.

Struct DisplayArraySlot contains mt::vec3 which must be aligned on
16 bytes, in consideration RAS_BoundingBox::m_slots uses
mt::simd_allocator to allocate with the proper alignement.

source/gameengine/Rasterizer/RAS_BoundingBox.h

@@ -93,7 +93,9 @@ class RAS_MeshBoundingBox : public RAS_BoundingBox
 		mt::vec3 m_aabbMax;
 	};
 
-	std::vector<DisplayArraySlot> m_slots;
+	/// The sub AABB per display array.
+	// Use aligned allocator because DisplayArraySlot use aligned members.
+	std::vector<DisplayArraySlot, mt::simd_allocator<DisplayArraySlot> > m_slots;
 
 public:
 	RAS_MeshBoundingBox(RAS_BoundingBoxManager *manager, const RAS_IDisplayArrayList& displayArrayList);