Fix item orientation bug. Items should now appear correctly.

src/items/item.cpp

@@ -40,7 +40,9 @@ Item::Item(ItemType type, const Vec3& xyz, const Vec3& normal,
     m_distance_2        = 1.2f;
     initItem(type, xyz);
     // Sets heading to 0, and sets pitch and roll depending on the normal. */
-    m_original_hpr      = Vec3(0, normal);
+    m_original_hpr.setHPR(btQuaternion(-normal.cross(Vec3(0, 1, 0)),
+                                        normal.angle(Vec3(0, 1, 0)))
+        );
     m_original_mesh     = mesh;
     m_original_lowmesh  = lowres_mesh;
     m_listener          = NULL;