Anki 2.1.54 Csv Support

[ohare93]

ankitects/anki-changes@3bda402

A new CSV importer & exporter, thanks to Rumo:

• Shows a preview based on the selected field separator.
• Column mapping includes field text for reference.
• Multiple decks and notetypes can now be imported/exported at once, as columns can be mapped to deck or notetype name.
• Supports exporting and importing a unique identifier for a note, to use instead of a matching first field. This removes the need for the 'add note id' add-on.
• Extends the header syntax so that files can specify metadata such as the desired field separator, and the mapping of fields.
• The new functionality is not enabled by default, and can be enabled with a checkbox in the preferences screen. This also enables
  the new apkg import/export code introduced in 2.1.52. If you use the Special Fields add-on, you will need to disable this option
  in order to use the add-on.

😮 🎉

Possible removal of CrowdAnki as a dependency...? 👀

[aplaice]

Quickly testing the functionality, it seems that this modified CSV import/export format still doesn't allow importing/exporting the templates of the note model (so if a user doesn't have the Ultimate Geography note type, they won't be able to get it, and we also wouldn't be able to update the templates). :/