Attach notes to combinators, entities... almost everything
+ Adds signposts.
All notes are saved when you export a blueprint as a string (but you need the mod to read them).
Undoing destruction of an object with a note attached does not restore note.
1. Have construction bots.
2. Create something, like a combinator.
3. Attach a note.
4. Delete the thing.
5. Undo the delete.
Expected: Rebuilt object has note attached.
Actual: Rebuilt object has no note.