- tag list stored in a separate DB table
- non-wildcard searches now do full unicode case folding
(eg tag:masse matches 'Maße')
- wildcard matches do simple unicode case folding
- some functions haven't been updated yet, so ascii folding will
continue to be used in some operations
- on collection load, the schema is upgraded to 12
- on collection close, the changes are reversed so older clients
can continue to open the collection
- in the future, we could potentially skip the reversal except
when exporting/doing a full sync
- the same approach should work for decks, note types and tags in the
future too
- the deck list code needs updating to cache the deck confs for the
life of the call
