- front/back/css shown in tabs
- front/back preview switchable; only one webview needs to be loaded
- dropdown to select cloze number in preview
- search box to search in front/back/css
- notetypes are fetched from the DB as needed, and cached in Python
- handle note type changes in the backend. Multiple operations can now
be performed in one go, but this is not currently exposed in the GUI.
- extra methods to grab sorted note type names quickly, and fetch by
name
- col.models.save() without a provided notetype is now a no-op
- note loading/saving handled in the backend
- notes with no valid cards can now be added
- templates can now be deleted even if they would previously
orphan notes
a number of fixmes have been left in notes.py and models.py
While it makes no sense to have the typing box on the front without
another non-empty field, "the front of this card is empty" when
a typing box is on the template seems to be confusing some users, so
it is clearer to show them the box.
