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Preparation for editable documents, without a change in behavior: views and documents get a template parameter Editable (false by default), and every walk over the index (iterators, lookups, dump(), materialize()) goes through detail::view::navigation<Editable>. For read-only documents it is the plain node array, as before, so they compile without any of the edit handling. For editable documents it also follows the representation of edits, which this commit defines: - node flags `edited` (a string or number token in the edit arena), `moved` (the elements of an array/object live in a separate sequence), and `is_new` (no source position), and link nodes (kind_link) that stand for a value stored elsewhere - document_data::edit_state: the moved sequences, the storage of new values, and the edit arena materialize() now keeps a frame per open container instead of returning to the end of a closed one, as the serializer does, so that it can follow moved sequences. Floats whose token lives in the edit arena (also "nan", "inf", "-inf") are converted out of line. dump() copies only strings of the source without escaping, and shrink_to_fit() leaves the node array in place once there are edits, as they link into it. Signed-off-by: Niels Lohmann <mail@nlohmann.me>