Implement DELOBJ source deletion policies

src/app/update/file.rs

@@ -392,6 +392,7 @@ impl OpenCADStudio {
             texteditmode: self.texteditmode,
             quick_dimension_snap_priority: self.quick_dimension_snap_priority,
             dimension_continue_mode: self.dimension_continue_mode,
+            delete_objects: self.delete_objects,
             textfill: crate::scene::text::sdf_atlas::textfill(),
             backup_on_save: self.backup_on_save,
             file_assoc_enabled: self.file_assoc_enabled,
@@ -460,6 +461,7 @@ impl OpenCADStudio {
         self.texteditmode = s.texteditmode;
         self.quick_dimension_snap_priority = s.quick_dimension_snap_priority.min(1);
         self.dimension_continue_mode = s.dimension_continue_mode.clamp(0, 1);
+        self.delete_objects = s.delete_objects.clamp(0, 3);
         crate::scene::text::sdf_atlas::set_textfill(s.textfill);
         self.backup_on_save = s.backup_on_save;
         self.file_assoc_enabled = s.file_assoc_enabled;