Added tech ENABLE_ENHANCED_RELOAD_FROM_DISK

1) Reworked void Plater::priv::reload_from_disk() to be more general

2) Added source data to class ModelVolume

3) Modified .3mf import/export to save/load volume matrices and source data

4) Incremented .3mf version to 2

src/slic3r/GUI/Selection.cpp

@@ -472,7 +472,11 @@ void Selection::volumes_changed(const std::vector<size_t> &map_volume_old_to_new
     for (unsigned int idx : m_list)
         if (map_volume_old_to_new[idx] != size_t(-1)) {
             unsigned int new_idx = (unsigned int)map_volume_old_to_new[idx];
+#if ENABLE_ENHANCED_RELOAD_FROM_DISK
+            (*m_volumes)[new_idx]->selected = true;
+#else
             assert((*m_volumes)[new_idx]->selected);
+#endif // ENABLE_ENHANCED_RELOAD_FROM_DISK
             list_new.insert(new_idx);
         }
     m_list = std::move(list_new);